[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.

[Effects of education level of men who have sex with men on their high risk sexual behaviors and the infection of HIV and syphilis].

OBJECTIVE: To study the effects of educational background of men who have sex with men (MSM) on their high risk sexual behaviors and the HIV/STI infection rates. METHODS: During July to November of 2009 and March to October of 2010, snowball and convenience sampling methods were adopted to recruit MSM from MSM venues and via the internet in Changzhou city of Jiangsu province, and finally 659 MSM were conducted a questionnaire survey and serological testing. According to the educational background of MSM, they were divided into 3 groups, that is, junior high school group (206 cases), high school group (254 cases), and university group (199 cases). The questionnaire mainly includes information on social demography, sexual behaviors, condom use, etc. Blood samples were collected for HIV and syphilis spirochete detection, and urine samples were also collected in 291 MSM who were recruited during July to November of 2009 for neisseria gonorrhoeae and chlamydia trachomatis nucleic acid detection. χ(2) test and other statistical analysis methods were used to compare the characteristics of sexual behaviors and HIV/STI infections in 3 groups. RESULTS: Of the 659 valid questionnaires returned, junior high school group, high school group, and university group accounted for 31.3% (206 cases), 38.5% (254 cases) and 30.2% (199 cases). Places where MSM of different education levels most often to seek sexual partners, were significantly different. Junior high school group and high school group mostly went to bath house/sauna club (56.3%, 116 cases) and bar (34.8%, 88 cases) for partners, respectively, while the university group sought partners mainly through the internet (41.1%, 81 cases) (χ(2) = 99.35, P < 0.05). 53.4% (109/204) of the junior high school group had anal sex with men in the last 6 months, which was higher than that of high school group (67.7%, 172/254) (χ(2) = 9.74, P < 0.05) and university group (72.7%, 144/198) (χ(2) = 16.04, P < 0.05) . A total of 54.4% (111/204) of the junior high school group had sex with women in the last 6 months, which was higher than that of university group (38.6%, 76/197) (χ(2) = 10.10, P < 0.05) , but was not statistically significantly different from that of high school group (46.9%, 119/254) (χ(2) = 2.59, P = 0.11) . The rates of condom use with men at the last anal sex in junior high school group (73.4%, 80/109) , high school group (78.0%, 131/168) and university group (73.9%, 105/142) were similar. The rates of condom use with women in the last intercourse in junior high school group, high school group and university group were 51.8% (57/110), 54.6% (65/119) and 61.8% (47/76), respectively(χ(2) = 1.88, P = 0.39) . In junior high school group, high school group and university group, the infection rates of HIV were 9.2% (19/206), 10.6% (27/254) and 5.6% (11/197) (χ(2) = 3.68, P = 0.16), the positive rates of neisseria gonorrhoeae were 3.8% (3/79), 3.4% (4/117) and 0.0% (0/95) (χ(2) = 3.85, P = 0.14), the positive rates of chlamydia trachomatis were 5.1% (4/79), 9.4% (11/117) and 4.2% (4/95) (χ(2) = 2.70, P = 0.26). The infection rate of syphilis in junior high school group was 19.9% (41/206), which was higher than high school group (12.2%, 31/254) (χ(2) = 5.11, P < 0.05) and university group (10.2%, 20/197) (χ(2) = 7.45, P < 0.05 ). CONCLUSION: There was no obvious correlation between education level and high risk sexual behaviors;MSM with lower education level were at higher risk of infection of syphilis.

[Comparative analysis on both high risk behaviours, infection of HIV and syphilis between married and unmarried men who have sex with men].

OBJECTIVE: To understand the distribution of marriage status among men who have sex with men (MSM) in the city of Changzhou, and to explore the impact of marriage on AIDS related high risk behaviors and HIV infection in this population. METHODS: Target sampling (snowball sampling) was adopted to carry out a cross-sectional study, and structured questionnaire-based interviews were conducted to collect information on social demography, HIV related high risk behaviors. Blood and urine samples were collected to detect HIV, syphilis, gonorrhea and Chlamydia trachomatis infections. RESULTS: Of the 655 participants, 37.4% were married. Married MSM mostly sought their sexual partners at the public bathing house (61.6%), while unmarried MSM were mainly through bars (33.6%) or internet (31.1%). The proportion of having anal sex with men during the last 6 months was lower in the married group (50.8%) than in the unmarried group (73.3%), (P < 0.001) The percentage of having sex with women in the last 6 months was significantly higher in the married group (68.9%) than that in the unmarried group (33.2%) (P < 0.001), (OR = 4.454, 95%CI: 3.168 - 6.261). The rates of condom use in the last anal sex with men in married and unmarried groups were 71.0% and 77.6%, respectively (P = 0.152). The rate of condom use in the last intercourse with women was significantly lower in the married group (44.0%) than that in the unmarried group (70.4%) (P < 0.001), (OR = 0.331, 95%CI: 0.205 - 0.535). In the sex trade, most of the married MSM would "buy" sex (66.7%), while unmarried MSM would "sell" sex (63.2%) (P < 0.05), (OR = 3.429, 95%CI: 1.255 - 9.366). The percentage of having drugs in the previous year was higher in married group (3.3%) than that in the unmarried group (0.8%) (P < 0.05). In married and unmarried groups, the infection rates of HIV, syphilis, gonorrhea and Chlamydia trachomatis appeared to be (8.6%, 8.6%), (17.1%, 12.3%), (1.6%, 2.4%), and (3.3%, 9.0%), respectively (P > 0.05). CONCLUSION: Marriage seemed to have had limited effects on reducing the high risk behaviors of MSM. Different and multiform interventions should be developed according to the different characteristics of married or unmarried MSM population.

[Study on serum selenium level of people in service sectors in Taigu County, Shanxi Province].

OBJECTIVE: To detect serum selenium level of people in non-selenium-deficiency region. METHODS: A total of 793 subjects were recruited by random sampling from people engaged in service sectors in Taign county, Shanxi province. Information about gender, age, occupation and educational level were collected and the content of serum selenium was measured by fluorospectrophotometry. All data were statistically analyzed with SPSS software version 13.0. RESULTS: The age distribution for these samples ranged from 20 to 67 years old. Their average serum selenium level and standard deviation (SD) were (0.0913 +/- 0.0186) mcirog/ml, (0.0947 +/- 0.0184) microg/ml and (0.0887 +/- 0.0184) microg/ml for total, male and female, respectively, and the level of male was significantly higher than that of female. There were no significant differences of serum selenium in each group of different ages, occupation, and educational level. Serum selenium in male were significantly higher than in female in both 20-29 years old group and 30-39 years old group, but there were no significant differences in groups older than 40. In 30-39 years old group, male had the highest serum selenium, but female occurred just the opposite. There was a decrease of serum selenium in male older than 40, but a great increase in female. CONCLUSION: The serum selenium level of adults in this area was adequate, but compared with progressed areas in the world, it could be categorized as low-middle level, serum selenium in male of 20-40 years old was significantly higher than in female, but the differences turn to be narrow in people older than 40 years old.