Current drug use as risk factor for erectile dysfunction: results from an Italian epidemiological study.

Several drugs have been associated with an increased risk of erectile dysfunction (ED). We analysed the role of pharmacological treatments on the risk of ED using data from a cross-sectional study on prevalence and risk factors for ED in the general population in Italy. A total of 2450 men aged more than 18 years were randomly identified by 143 general practioners (GP) among their registered patients and invited to a confidential interview by their GP. Patients were asked 'about their ability to achieve and maintain an erection sufficient for satisfactory sexual performance'. If they were dissatisfied, they were defined as having ED. Out of the 2450 men identified, 440 (18%) refused to participate. The present analysis therefore includes information on 2010 men. After adjustment for related pathologies, anxiolytics and antidepressants showed insignificantly higher odds ratio (ORs, respectively, 1.7 and 2.1); antipsychotic drug use significantly increased the risk of ED (OR 9.0, 95% confidence interval, CI 1.8-44.4). Diuretics (OR 3.1, 95% CI 1.4-6.9) and anticholinergic drugs (OR 12.8, 95% CI 2.7-60.1) were associated with ED risk. No association emerged between ED and H2 antagonists, anticholesterolemic or hypoglycemic drugs. In conclusion, after taking account of related pathologies, our results suggest that men treated with antipsychotic, diuretic and anticholinergic drugs are at greater risk of ED.

Resource utilization and hospital cost of HIV/AIDS care in Italy in the era of highly active antiretroviral therapy.

This study set out: (1) to describe resource utilization patterns among four groups of HIV-infected patients at different stages of the disease, and (2) to estimate the direct hospital costs of HIV/AIDS care among these patients in Italy. It is a multi-centre, prospective observational study conducted between August 1997 and July 1998. The 483 patients, enrolled in five infectious diseases departments located in different areas of Italy, were stratified into four groups according to their CD4+ lymphocyte cell count and status of AIDS Defining Illness (ADI) at enrolment. Average direct hospital costs (L = Italian Lire, 1997 exchange rate US$ 1 = 1,704 Italian Lire) were L.23,725,584 (US$ 13,923.5), L.15,208,287 (US$ 8,925.1), L.11,942,761 (US$ 7,008.7) and L.7,660,942 (US$ 4,495.9) for the four groups of patients. More than 80% of patients in the first group and about 65% of patients in the second group received highly active antiretroviral therapy (HAART). The proportion of patients receiving HAART in the third and fourth group increased from 37.1% to 56.5% and from 15.3% to 31.5%. The number of hospital days observed in this study was much lower than previously published numbers in Italy. These results may indicate a shift of costs from hospitalisation to outpatient care and ARV.

Dietary factors and risk of spontaneous abortion.

OBJECTIVE: This study examines the association between dietary habits and risk of spontaneous abortion. DESIGN: Hospital-based case-control study. SETTING: Obstetric hospitals in Milan, Italy. SUBJECTS: Cases were: 912 women admitted for spontaneous abortion (within the 12th week of gestation). Controls were: women who gave birth at term to healthy infants on randomly selected days at the same hospitals where cases had been identified. RESULTS: The risk of spontaneous abortion was inversely and significantly related to green vegetables, fruit, milk, cheese, eggs and fish consumption. The multivariate odds ratios (OR), for highest versus lowest levels of intake, were 0.3 for fruit, 0.5 for cheese, 0.6 for green vegetables and milk and 0.7 for fish and eggs. The major type of seasoning fats have showed a direct association with risk of miscarriage. Comparing the highest with the lowest intake, the ORs were 2.0 (95% confidence interval, CI 1.1-3.6) and 1.6 (95% CI 1.1-2.3) for butter and oil, respectively. No consistent association emerged between meat, liver, ham and carrots intake and the risk of spontaneous abortion. CONCLUSIONS: This result suggests that a diet poor in several aspects, including vegetables and fruit, milk and dairy products, but rich in fats, may be a determinant or a correlate of increased risk of spontaneous abortion.

Determinants of different Candida species infections of the genital tract in women. Sporachrom Study Geoup.

OBJECTIVE: We have analyzed the differences in the epidemiological characteristics of women with different Candida low female genital tract infection. STUDY DESIGN: Eligible for the study were 4228 women aged 18-70 years with symptomatic low gynecological tract infection and clinical findings suggestive for Candida infection consecutively attending during the study period first level outpatients gynecological services in Italy. CHROMagar Candida method was used to identify albicans and non-albicans species and among non-albicans ones Candida glabrata, tropicalis and krusei. RESULTS: Out of the 4228 women who entered the study, Candida infection was confirmed by CHROMagar test in 3351 cases (79.3%): Candida albicans was identified in 1431 cases (43%) and non-albicans in 1920. Among the 1920 women with non-albicans infection, Candida glabrata was identified in 1207 women, Candida krusei in 290, Candida tropicalis in 404 (in 19 cases other species or non-specified species were involved). Candida albicans infection was more frequently reported than non-albicans ones in diabetic women (Odds Ratio, OR=1.7, 95%, Confidence Interval, CI 1.1-2.7). Current oral contraceptive users tended more frequently to be infected with Candida albicans than non-albicans, however the estimated OR was only slightly above unity and of borderline statistical significance (OR 1.3, 9.5%, CI 1.1-1.5). Women reporting previous treatment with topic antimicotic reported more frequently non-albicans infection, than Candida albicans ones. However the association was limited and of borderline statistical significance (OR albicans vs. non albicans 0.7, 95% CI 0.5-1.0). Albicans infection was more frequently identified in women whose partner reported symptomatology for Candida infection (OR 1.7, 95% C.I. 1.4-2.0). CONCLUSIONS: This study shows that in this Italian population with symptomatic Candida infection of low female genital tract, there are some differences in the epidemiological characteristics of women with albicans and non-albicans infection.

[The assessment of the coronary risk in a work setting. The results of the SEMM study and the outlook for prevention in Italy. Surveillance of Employees Municipality of Milan]. / Valutazione del rischio coronarico in collettività lavorative. Risultati dello studio SEMM (Surveillance of Employees Municipality of Milan) e prospettive di prevenzione in Italia.

BACKGROUND: The goals of the present report are to assess the differences in distribution of traditional coronary risk factors in a work setting, aimed at identifying specific groups at risk and to compare mean values of such risk factors and of an overall risk score of the entire working sample with the results observed in the third WHO-MONICA population survey carried out in northern Italy (Area Brianza). METHODS: In the SEMM study 7872 employees (2601 men and 5271 women) were enrolled between 1992 and 1996. The third MONICA survey in Brianza was carried out on an age- and gender-stratified random sample of 831 men and 884 women in 1993-1994, selected from the 25-64-year-old residents of five municipalities, representative of the study population. In both studies coronary risk factors were measured according to the MONICA protocol, adopting standardized methods. RESULTS: In comparison with the MONICA population sample, the entire working group showed lower mean levels of blood pressure and total cholesterol, higher prevalence of current cigarette smokers and lower mean levels of HDL cholesterol, in both gender groups. Prevalence of overweight subjects was higher among men in the working group, but the opposite pattern was detected in women. The overall risk score, calculated using the coefficients of a proportional hazard survival equation estimated in a large collaborative Italian follow-up study, resulted lower in the working sample, in both gender groups. This result may be attributed to a selection bias known in occupational epidemiology as "healthy worker effect". In contrast to this finding, the prevalence of smokers, in particular among women, was higher in the employed sample, indicating that working stress conditions may play some role. CONCLUSIONS: In order to extend the assessment of cardiovascular risk factors as well as prevention activities in work settings, some advantages are highlighted: the high participation rates, the feasibility to adopt standardized protocols, and easier and cheap procedures for censoring in follow-up studies. Moreover, due to the recently adopted legislation in Italy which increases the number of working categories to be included in periodic clinical examinations, prevention activities in work settings to contrast the epidemic of widespread chronic diseases, like cardiovascular diseases, are encouraged. This will also allow for the investigation of individual variations over time of coronary risk factors.

Incidence of adverse reactions in HIV patients treated with protease inhibitors: a cohort study. Coordinamento Italiano Studio Allergia e Infezione da HIV (CISAI) Group.

OBJECTIVE: To assess the probability that protease inhibitor (PI) therapy might be discontinued because of adverse events (AE) and to evaluate the incidence rate of adverse reactions during PI treatment. DESIGN: A prospective cohort, multicenter study on HIV-positive patients starting treatment with at least one PI. SETTING: Ten departments of infectious diseases in Northern Italy. PATIENTS: A total of 1207 patients who started PI therapy in September 1997 and were consecutively observed up to April 1999. MAIN OUTCOME MEASURES: Adverse reactions following initiation of PI therapy, and time to therapy discontinuation due to AE. RESULTS: During the study period, 35.9% patients presented adverse reactions of any grade, whereas 9.7% presented at least one serious AE. After 12 months of treatment, the percentage of patients who had interrupted treatment was 36% of ritonavir-treated patients, 14.2% of those treated with indinavir, 13.6% of ritonavir-saquinavir hard gel capsules (HGC)-treated patients, and 8.5% and 2.1%, respectively, for those treated with nelfinavir and saquinavir HGC. Women and patients with hepatitis experienced a significantly greater number of adverse events compared with other categories. Gastrointestinal events were more frequently observed in patients treated with either ritonavir alone or in combination with saquinavir HGC, as well as in patients receiving nelfinavir, although in this group serious events were rare. Here again, neurologic, metabolic, and hepatic toxicity occurred more frequently in ritonavir and ritonavir-saquinavir HGC treated patients. Allergic reactions were more often observed in patients receiving nelfinavir. Indinavir-treated patients presented the highest incidence of renal toxicity. CONCLUSION: Ritonavir is the drug associated with the largest number of reactions, which appear during the first few months of treatment. Saquinavir HGC and nelfinavir are the best tolerated drugs in a clinical setting.

Estroprogestin vs. gonadotrophin agonists plus estroprogestin in the treatment of endometriosis-related pelvic pain: a randomized trial. Gruppo Italiano per lo Studio dell'Endometriosi.

OBJECTIVE: This is a randomized clinical trial comparing estroprogestin (E/P) pill given for 12 months vs. gonadotrophin releasing hormone agonist (GNRHa) given for 4 months followed by E/P pill treatment for 8 months in the relief of endometriosis-related pelvic pain. METHODS: Eligible for the study were women with laparoscopically confirmed endometriosis and pelvic pain lasting 3-12 months after diagnosis. Eligible women were randomly assigned to treatment with E/P pill (gestroden 0.75 mg and ethynlestradiol 0.03 mg) for 12 months (47 patients) vs. tryptorelin 3.75 mg slow release every 28 days for 4 months followed by E/P pill for 8 months (55 patients). RESULTS: At baseline, dysmenorrhea was reported in 46 women allocated to E/P pill only (97.9%), and in all the 55 women allocated to GNRHa+E/P pill. The corresponding value at the 12 months follow-up visit was 14 subjects (35.9%) and 16 subjects (34.8%). The baseline median values of the multidimensional and analog scale were for dysmenorrhea 4 and 6 in the EP only and 3 and 6 in the GNRHa+E/P group. The corresponding value at the 12 months follow-up visit were 2 and 6 and 0 and 5. Non-menstrual pain was reported, respectively, at baseline and 12 month visit by 46 (97.9%) and 15 (38.5%) subjects in the E/P pill group and 49 (89.1%) and 17 (37.0%) of the GNRHa+E/P pill one. The baseline median values of the multidimensional and analog scale were for non-menstrual pain 3 and 5 in the E/P only and 2 and 6 in the GNRHa+E/P group. The corresponding values at the 12 month follow-up visit were 0 and 4 and 0 and 4. These differences between the two groups were not statistically significant. CONCLUSIONS: 1 year after randomization, the two treatment schedules show similar relief of pelvic pain in women with endometriosis.

Diet and uterine myomas.

OBJECTIVE: To analyze the relation between selected dietary indicators and the risk of uterine myomas. METHODS: We used data from a case-control study on risk factors for uterine myomas conducted in Italy between 1986 and 1997. Cases included 843 women with uterine myomas whose clinical diagnoses dated back no more than 2 years. Controls were 1557 women younger than age 55 who had not had hysterectomies and were admitted for acute nongynecologic, nonhormonal, nonneoplastic conditions. RESULTS: Women with uterine myomas reported more frequent consumption of beef, other red meat, and ham and less frequent consumption of green vegetables, fruit, and fish. The multivariate odds ratios in the upper tertile were 1.7 for beef and other red meat (95% confidence interval [CI] 1.4, 2.2), 1.3 for ham (95% CI 1.0, 1.6), 0.5 for green vegetables (95% CI 0.4, 0.6), and 0.8 for fruit consumption (95% CI 0.6, 1.0). CONCLUSION: Myoma is associated with beef and ham consumption, whereas high intake of green vegetables seems to have a protective effect.

Oral contraceptive use and risk of endometriosis. Italian Endometriosis Study Group.

OBJECTIVE: To analyse the association between use of oral contraception and risk of pelvic endometriosis. DESIGN: We compared use of oral contraception in women with and without endometriosis. PARTICIPANTS: Eligible for the study were women with primary or secondary infertility (n = 393) or chronic pelvic pain (n = 424), requiring laparoscopy, consecutively observed between September 1995 and January 1996 in 15 obstetrics and gynaecology departments in Italy. RESULTS: Out of the 817 women included in the study, 345 had a diagnosis of endometriosis; 164 (47.5%) women with endometriosis and 139 (29.4%) without the disease reported ever using oral contraception. In comparison with never users the estimated odds ratios (OR) of endometriosis were 1.8 (95% CI 1.0-3.3) in current users and 1.6 (95% CI 1.1-2.4) in ex-users. No clear relation emerged between duration of oral contraceptive use and risk of endometriosis. In comparison with never users, the OR was 1.8 (95% CI 1.1-3.0) for women reporting their last use of oral contraception < 5 years before interview and 1.5 (95% CI 0.9-2.5) for those reporting their last use > or = 5 years before interview. CONCLUSIONS: The study suggests that oral contraception is associated with an increased risk of endometriosis but this finding is based on a selected population and cannot generalised to all women with endometriosis.

Reproductive factors, family history, occupation and risk of urogenital prolapse.

OBJECTIVE: We conducted a case-control study to analyze risk factors for urogenital prolapse requiring surgery. METHODS: Cases were 108 women with a diagnosis of II or III degree uterovaginal prolapse and/or third degree cystocele. Controls were 100 women admitted to the same hospitals as the cases, for acute, non-gynecological, non-neoplastic conditions. RESULTS: Occupation showed an association with urogenital prolapse: in comparison with professional/managerial women, housewives had an odds ratios (OR) of urogenital prolapse of 3.1 (95% confidence interval (CI), 1.6-8.8). Compared with nulliparae, parous women tended to have a higher risk of genital prolapse (OR 2.6, 95% CI 0.9-7.8). In comparison with women reporting no vaginal delivery, the ORs were 3.0 for women reporting one vaginal delivery (95% CI 1.0-9.5), and 4.5 (95% CI 1.6-13.1) for women with two or more vaginal deliveries. Forceps delivery and birthweight were not associated with risk of prolapse after taking into account the effect of number of vaginal deliveries. The risk of urogenital prolapse was higher in women with mother or sisters reporting the condition: the ORs were, respectively, 3.2 (95% CI 1.1-7.6) and 2.4 (95% CI 1.0-5.6) in comparison with women whose mother or sisters reported no prolapse. CONCLUSIONS: Our data support the clinical suggestion that parous women are at a higher risk of prolapse and the risk increases with number of vaginal deliveries. First-degree family history of prolapse seems to increase the risk of prolapse.

Placental ratio in pregnancies at different risk for intrauterine growth.

OBJECTIVE: We have analyzed the placental/birthweight ratio in women at increased risk of intrauterine growth retardation and pregnancy-induced hypertension and in women with pregnancy 'complicated' by these conditions. STUDY DESIGN: A total of 89 women with small gestational age (SGA) infants, 355 with appropriate gestational age infants (200 in the uncomplicated pregnancy group) and 28 with large for gestational age (LGA) infants were considered. RESULTS AND CONCLUSION: The mean placental weight showed a significant increase from the SGA to the LGA in the two groups. The placental ratio tended to increase from the LGA group to the SGA one both in infants of women with uncomplicated pregnancy and with pregnancy complicated by intrauterine growth retardation or pregnancy-induced hypertension; these findings were statistically significant.

Paternal and maternal smoking habits before conception and during the first trimester: relation to spontaneous abortion.

PURPOSE: This study examined the association between maternal smoking before and during the first trimester of pregnancy and spontaneous abortion. METHODS: We have been conducting a hospital-based case-control study on risk factors for spontaneous abortion in the greater Milan area. We collected information from 782 cases of spontaneous abortions and 1543 controls (women who delivered at term healthy infants). RESULTS: With respect to never smokers, the odds ratio (OR) were 0.7 (95%, confidence interval (CI), 0.5-1.0) for women who quit smoking and 1.3 (95% CI, 1.0-1.6) for those who continued during pregnancy. Women who smoked more than 10 cigarettes/day in the first trimester were at increased risk of miscarriage, with an OR of 1.4 (95% CI, 1.0-2.1). No relationship was evident between the number of cigarettes smoked before conception and the risk of abortion. Likewise, no association emerged between paternal smoking and miscarriage. Moreover, no significant interaction or modification effect was obtained when strata of age and other major characteristics were investigated. CONCLUSIONS: The risk of abortion associated with cigarette smoking during the first trimester of pregnancy was measurable and noticeable in this population, and accounted for 9% (95% CI, 6-13%) of all cases. The increased risk of spontaneous abortion in women smoking during pregnancy is a further reason to encourage pregnant women to quit.

Coffee consumption and risk of hospitalized miscarriage before 12 weeks of gestation.

In order to analyse the association between drinking coffee in pregnancy and risk of spontaneous abortion, a case-controlled study was conducted in Milan, Northern Italy. Cases were 782 women with spontaneous abortion within the 12th week of gestation. The control group was recruited from women who gave birth at term (> 37 weeks gestation) to healthy infants on randomly selected days at the same hospitals where cases had been identified: 1543 controls were interviewed. A total of 561 (72%) cases of spontaneous abortion and 877 (57%) controls reported coffee drinking during the first trimester of the index pregnancy. The corresponding multivariate odds ratios of spontaneous abortion, in comparison with non-drinkers, were 1.2, 1.8 and 4.0, respectively, for drinkers of 1, 2 or 3, and 4 or more cups of coffee per day. No relationship emerged between maternal decaffeinated coffee, tea and cola drinking in pregnancy, as well as paternal coffee consumption, and risk of spontaneous abortion. With regard to duration in years of coffee drinking, the estimated multivariate odds ratios of spontaneous abortion were, in comparison with non-coffee drinkers, 1.1 (95% confidence interval (CI) 0.9-1.4) and 1.9 (95% CI 1.5-2.6) for women reporting a duration of coffee consumption < or = 10 or > 10 years. In conclusion, coffee drinking early in pregnancy was associated with an increased risk of abortion. This has biological implications, but epidemiological inference on the causality is difficult and still open to debate.

Induced abortion in the first trimester of pregnancy and risk of miscarriage.

OBJECTIVE: To analyse the relation between induced abortion and risk of subsequent miscarriage. DESIGN: Case-control study conducted between February 1990 and May 1995. PARTICIPANTS: Case group included 782 women (median age 32 years, range 14-46) admitted for spontaneous abortion (within the 12th week of gestation) to a network of obstetric departments in the greater Milan area. The control group was recruited among women who gave birth at term (> 37 weeks of gestation) to healthy infants on randomly selected days at the hospitals where cases had been identified. A total of 1543 controls (median age 30 years, range 14-45) were interviewed. RESULTS: A total of 102 cases (13%) and 181 controls (12%) reported one or more induced abortions. No clear relation emerged between miscarriage and induced abortions. In comparison with women reporting no induced abortion the odds ratio (OR) for miscarriage were 1.1 (95% CI 0.8-1.4) in women reporting one induced abortion and 0.9 (95% CI 0.4-1.8) in women reporting two or more. Likewise, there was no association between time since last and age at first induced abortion and risk of miscarriage. CONCLUSIONS: This study did not find any strong association between induced and spontaneous abortion.

PIP: The association between induced abortion and the risk of miscarriage in subsequent pregnancies was assessed in a case-control study conducted in Italy in 1990-95. 782 women (median age, 32 years) admitted to hospital obstetrics departments in Milan with spontaneous abortion in the first trimester of pregnancy were enrolled as cases, while 1543 women (median age, 30 years) who had a live, full-term birth at the same hospitals served as controls. Compared to controls, women with a spontaneous abortion were significantly more likely to be unmarried, to have a low educational level, and to have a history of pelvic inflammatory disease and previous miscarriage. 102 cases (13%) and 181 controls (12%) reported 1 or more induced abortions. Compared with women reporting no induced abortion, the odds ratio for miscarriage was 1.1 (95% confidence interval (CI), 0.9-1.4) in women reporting 1 induced abortion and 0.9 (95% CI, 0.4-1.8) in women reporting 2 or more induced abortions. Thus, this study failed to document a significant association between induced and spontaneous abortion. Moreover, there was no relationship between time since last induced abortion or age at first induced abortion and risk of miscarriage.

[Follow-up of children included in the Italian Study on the Use of Low-Dose Aspirin During Pregnancy: development at 18 months of life and birth weight]. / Follow-up dei bambini inclusi nello Studio Italiano sull'utilizzo di basse dosi di Aspirina in gravidanza: sviluppo a 18 mesi di vita e peso alla nascita.

To assess the relationship between birthweight and the child's development at 18 months of age, we sent a postal questionnaire to the parents of 861 singleton children, born in the framework of the Italian Study of Aspirin in Pregnancy, 18 months after delivery. A total of 623 (72.4%) were returned. There were 94 children weighing < 2500-1500 g at birth and 19 < 1500 g. Children with weight and height less than the 10th percentile at 18 months were significantly more frequent in the low birthweight group (p < 0.01). Motor problems were about six times more common in children with birthweight less than 2500 g than in those with birthweight > or = 2500 g (p < 0.001). A larger proportion of children with birthweight < 2500 g than > or = 2500 g had respiratory problems (15% vs 11%, p = ns). Finally admission to hospital was more common in children with birthweight less than 2500 g (p < 0.01). This study confirms the differences in growth and development for children in low and normal birthweight groups.

Exposure to video display terminals and risk of spontaneous abortion.

Clusters of spontaneous abortion among video display terminal (VDT) users in North America and Canada in the late 1970s aroused suspicion about the potential risk of an association between VDT. exposure and pregnancy outcome. This case-control study considered the association between VDT use and the risk of miscarriage. Cases were 508 women admitted for spontaneous abortion to the Clinica Luigi Mangiagalli and a network of obstetric departments in the Milan area. Controls were 1,148 women who gave birth at term to healthy infants on randomly selected days at the same hospitals where cases were identified. No association emerged between VDT exposure and spontaneous abortion, the estimated odds ratio being 1.0 (95% CI: 0.8-1.2). This evidence agrees with studies conducted in different countries by various authors.

Dietary habits, reproductive and menstrual factors and risk of dysmenorrhoea.

In order to analyze risk factors for dysmenorrhoea, we conducted a case-control study. Cases were 106 women (median age 27 years) with moderate or severe dysmenorrhoea lasting 12 months or more. Controls were 145 women (median age 26 years) without dysmenorrhoea, admitted for routine gynecological examination at the outpatient gynecological services of the same clinic where cases had been identified. In comparison with women reporting short menstrual cycles (every 25 days or less) the relative risk (RR) of dysmenorrhoea was 2.0 and 2.6, respectively, in those reporting their menstrual cycles of 26-30 days and of 31 days or more, and the RR was 3.6 (95% confidence interval (CI): 1.0-13.4) for women reporting totally irregular menstrual cycles. The estimated RRs were, in comparison with women reporting menstrual flows lasting 4 days or less, respectively 2.2 and 1.9 in those reporting menstrual flows lasting 5 and 6 days or more. Fourty-four (58%) cases but only seven (5%) controls reported heavy menstrual flows (RR in comparison with women reporting slight or normal menstrual flow 12.6, 95% CI: 5.0-32.1). As regards dietary factors, no associations emerged between the various food items, with the exception of cheese and eggs, which tended to be more frequently consumed by cases than controls. The results of this study suggest that the risk of dysmenorrhoea is higher in women with irregular, long and heavy menstrual flows. No association emerged between reproductive history and dysmenorrhoea. Likewise, no clear relationship emerged between intake of several dietary factors and risk dysmenorrhoea.

The epidemiology of gestational trophoblastic disease.

Considerable progress has been made in the knowledge of the epidemiology of gestational trophoblastic disease (GTD) in the last few years. There are two main and widely known points related to this disease: its geographical distribution and the different frequency in the various classes of age. GTD is more frequent in South-East Asia, India and Africa, and is rare in European and North American populations. For example, in the United States, the frequency of GTD was 108 per 100,000 pregnancies in the 1970's. In Europe, particularly in Italy, frequencies are lower. In northern Italy, the frequency of hydatidiform mole, in the period 1979-1982, was equal to 62 per 100,000 pregnancies, but in Indonesia and in China, the reported rates were 993 and 667 per 100,000 pregnancies respectively. GTD disease is more frequent in the extreme classes of age (under 20 and over 40 years) and the risk may be more than 100 times greater over 50 years. Besides these risk factors, the possible role of both genetic (familiarity, blood groups) and environmental factors (diet, cigarette smoking, etc.) has been investigated on the onset of GTD. This paper reviews the epidemiologic knowledge on GTD.