[Plasma selenium level and influencing factors of student men who have sex with men in Changzhou City from 2014 to 2017].

Objective: To understand the plasma selenium level of student men who have sex with men(MSM) in Changzhou and its influencing factors.

Methods: A total of 251 male students with previous male sexual history, 15-25 years of age who had been consulted by VCT clinics in Changzhou were included in this study from January 1, 2014 to December 31, 2017. Questionnaires referred to AIDS sentinel surveillance were conducted to provide information about demographic characteristics and behaviors. Blood samples were collected for syphilis and HIV antibody detection. Selenium in plasma was detected by inductively coupled plasma mass spectrometry. The influencing factors of plasma selenium level among student MSM were screened by classification tree model.

Results: The average age of objects was(20. 74±1. 94)years and the average plasma selenium level was(82. 30+12. 05) ng/mL. Educational attainment was mainly college or above, 77. 69%, and HIV antibody positive rate was 29. 48%. Plasma selenium was(87. 39±11. 37) ng/mL among student MSM with college or above, not infected with HIV and older than 20. 5 years, but was(78. 19±13. 48) ng/mL among those who were high school and below. Three related factors were screened out by the classification tree model, including education level, HIV infection status and age. The most important factor was education level. The estimate of substitution and cross-validation of the classification tree model were 131. 87 and 135. 11, and the standard error were 10. 50 and 10. 89, respectively.

Conclusion: The related factors of plasma selenium level among student MSM are education level, HIV infection status and age.