RESUMO
OBJECTIVE: To explore the mediating effect of mental health on job burnout and aggressive driving behavior in bus drivers. METHODS: A total of 447 bus drivers was selected as study subjects using a convenience sampling method. The status of job burnout, mental health and aggressive driving behaviors were investigated using the Maslach Burnout Inventory-Human Services Survey, Symptom Check List 90, and the Aggressive Driving Questionnaire. RESULTS: The score of aggressive driving behaviors of bus drivers were positively correlated with emotional exhaustion, depersonalization, personal accomplishment dimension score and mental health total score[Spearman correlation coefficient(r_S)=0.23, 0.27, 0.15, 0.34, all P<0.01]. The mental health total score was positively correlated with emotional exhaustion and depersonalization dimensions scores(r_S=0.46, 0.47, all P<0.01), and not correlated with personal accomplishment dimension score(r_S=-0.04, P>0.05). Emotional exhaustion can affect aggressive driving behaviors through mental health, and the standardized mediating value was 0.16, accounting for 72.7% of the total effect. Depersonalization can influence aggressive driving behaviors through mental health, and the standardized mediating value was 0.17, accounting for 70.8% of the total effect. CONCLUSION: Mental health plays a mediating role in emotional exhaustion, depersonalization and aggressive driving behavior of bus drivers.
RESUMO
<p><b>OBJECTIVE</b>To evaluate the sensitivity and usefulness of 99mTc-sestamibi scintigraphy (SS) and neck ultrasonography (US) as preoperative localization procedures in patients with primary hyperparathyroidism (pHPT).</p><p><b>METHODS</b>160 patients with proved pHPT in Peking Union Medical College Hospital from June 1983 to June 2002 were studied. There were 107 women(66.9%) and 53 men (33.1%), with a mean age of 38.9 years (10-73 years). 100 patients were underwent SS and 148 patients were underwent US prior to surgery, and the results were compared with operative and histological findings.</p><p><b>RESULTS</b>The sensitivity of SS and US in localization of the enlarged parathyroid glands was 94.0% and 85.1% respectively, and the positive predictive value of SS and US was 100% and 89.1% respectively, the overall sensitivity was 98.9% by combination of SS and US. In solitary parathyroid adenomas group (n = 145), the sensitivity of SS and US was 93.3% and 84.7% respectively; There was no significant difference (P = 0.428) in sensitivity of SS between the parathyroid glands correctly identified and undetected in classical neck location as compared with ectopic parathyroid glands, whereas significantly (P = 0.026) influenced by the US sensitivity.</p><p><b>CONCLUSIONS</b>Different sensitivity exit between SS and VS in preoperative localization in patients with pHPT undergoing parathyroidectomy. The combined use of SS and US could increase the sensitivity of localization technique. Ectopic parathyroid had no influence on the sensitivity of 99mTc-MIBI scanning, but decreased the sensitivity of ultrasonography. The size of parathyroid tumors had effects on the sensitivity of ultrasonography. Otherwise, various conditions causing SS false negative were observed. Some interfere factors should be excluded when SS negative results were encountered in clinical practice.</p>
