Mobile phone use, school electromagnetic field levels and related symptoms: a cross-sectional survey among 2150 high school students in Izmir.

BACKGROUND: Health outcomes of electromagnetic fields (EMF) from mobile phones and their base stations are of concern. Conducting multidisciplinary research, targeting children and exploring dose-response are recommended. Our objectives were to describe the mobile phone usage characteristics of high school students and to explore the association between mobile phone usage characteristics, high school EMF levels and self-reported symptoms. METHODS: This cross-sectional study's data were collected by a survey questionnaire and by measuring school EMF levels between November 2009 and April 2011. A sample size of 2530 was calculated from a total of 20,493 students in 26 high schools and 2150 (85.0%) were included in the analysis. The frequencies of 23 symptoms were questioned and analysed according to 16 different aspects of mobile phone use and school EMF levels, exploring also dose-response. School EMF levels were measured with Aaronia Spectran HF-4060 device. Chi square and trend tests were used for univariate and logistic regression was used for multivariate analyses. RESULTS: Among participants, 2021 (94.0%) were using mobile phones and 129 (6.0%) were not. Among users, 49.4% were speaking <10 min and 52.2% were sending/receiving 75 or more messages per day. Headache, fatigue and sleep disturbances were observed respectively 1.90 (95% CI 1.30-2.77), 1.78 (1.21-2.63) and 1.53 (1.05-2.21) times more among mobile phone users. Dose-response relationships were observed especially for the number of calls per day, total duration of calls per day, total number of text messages per day, position and status of mobile phone at night and making calls while charging as exposures and headache, concentration difficulties, fatigue and sleep disturbances as general symptoms and warming of the ear and flushing as local symptoms. CONCLUSIONS: We found an association between mobile phone use and especially headache, concentration difficulties, fatigue, sleep disturbances and warming of the ear showing also dose-response. We have found limited associations between vicinity to base stations and some general symptoms; however, we did not find any association with school EMF levels. Decreasing the numbers of calls and messages, decreasing the duration of calls, using earphones, keeping the phone away from the head and body and similar precautions might decrease the frequencies or prevalence of the symptoms.

Adolescents' risk perceptions on mobile phones and their base stations, their trust to authorities and incivility in using mobile phones: a cross-sectional survey on 2240 high school students in Izmir, Turkey.

BACKGROUND: Use of mobile phones has rapidly risen among adolescents despite a lack of scientific certainty on their health risks. Risk perception is an important determinant of behavior, and studies on adolescents' risk perceptions of mobile phones or base stations are very scarce. This study aims to evaluate high school students' risk perceptions on mobile phones and base stations, their trust to authorities, their opinions regarding incivility while using mobile phones and to assess associated factors. METHODS: For this cross-sectional study, 2530 students were chosen with stratified cluster sampling among 20,493 high school students studying in Bornova district of Izmir, Turkey, among whom 2240 (88.5%) participated. Risk perceptions and opinions were questioned with a 5-point Likert scale for 24 statements grouped under four dimensions. The mean responses to the four dimensions were categorized as <3.5 (low) and ≥3.5 (high) and the determinants were analyzed with logistic regression. RESULTS: Mean risk perception scores for the mobile phone, base station, trust to authority and incivility dimensions were 3.69 ± 0.89, 4.34 ± 0.78, 3.77 ± 0.93, 3.16 ± 0.93 and the prevalence of high risk perception was 65.1%, 86.7%, 66.2%, 39.7%, respectively. In the mobile phone dimension; students attending industrial technical high school had lower risk perceptions while female students, lower mothers' education groups and students not using mobile phones (OR = 2.82, 95% CI = 1.80-4.40) had higher risk perceptions. In the base station dimension girls had higher risk perceptions (OR = 1.68, 95% CI = 1.20-2.37). Girls and students attending industrial technical high school had significantly lower risk perception however 11-12th grade group perceived the risk higher (OR = 1.45 95% CI = 1.15-1.84) in the trust to authority dimension. For the incivility dimension, female students (OR = 1.44, 95% CI = 1.14-1.82), illiterate/only literate mothers (OR = 1.79, 95% CI = 1.04-2.75) and students not using mobile phones (OR = 2.50, 95% CI = 1.62-3.87) perceived higher risk. CONCLUSIONS: Understanding the effects of these determinants might aid in developing more effective educational interventions to specific subgroups on this topic. As debates on the health consequences of electromagnetic fields continue, it would be cautious to approach this issue with a preventive perspective. Efforts should be made to equalize the varying level of knowledge and to ensure that students are informed accurately.

Prevalence of prostate cancer among men aged 40+ living in Osman Gazi health care district.

BACKGROUND: Prostate cancer is a risk for men aged 40+ even if it is rarely seen among men under the age of 50. It is asymptomatic disease in its early period and if the person does not have an enlarged prostate it will be overlooked without screening. Consequently, the only way to diagnose prostate cancer in its early period is to determine the serum PSA (prostate-specific antigen) level of men aged 40+ and to do a digital rectal examination (DRE). OBJECTIVE: The aim of this study is to determine the prevalence of prostate cancer among men aged 40+, to mention the significance of DRE and PSA by means of a training to be done with the aid of a booklet about early diagnosis, and to encourage men to consult a doctor and get the right treatment at the right time. METHODS: The research was a descriptive field study. carried out among 660 men aged 40+ out of 3,285 men who live in Osman Gazi Health Care District, connected with the Presidency of Training and Research Health Group of Bornova. This group was selected as the smallest sample size by the systematic sampling method within the frame of setting the prevalence of prostate cancer at 10%, the confidence interval as 95%, the standard error as 2%. A total of 264 men of the sample group (participation rate 40%) agreed to a survey of International Prostate Symptom Score (I-PSS) projected by the study, and underwent DRE and PSA with a blood sample. RESULTS: Increase in the serum PSA level (4 ng/mL<) was determined in 10 men. Nodules were detected in 3 men together with the increase in PSA. One further nodule was detected only in DRE one examination of 12 participants. In the light of these data, it was decided to conduct a biopsy on 25 people, who had an increase in PSE and/or whose abnormalities were detected during DRE, in company with TRUS, and prostate cancer was detected in the biopsies of 5 people (1.89%). CONCLUSIONS: It can be thought that before a decision is made on routinizing prostate cancer screening, it may be more suitable to make randomized controlled screening trials for prostate cancer.