Table 2.
Estimated age (years) at first homosexual encounter using the additive randomized response technique model among men who have sex with men in Beijing, China, 2010
| Items | n |  |
μc |  |
Var() |
95% CI |
|---|---|---|---|---|---|---|
| All participants | 659 | 26.2 | 4.5 | 21.7 | 0.06 | 21.2–22.2 |
| Age group | ||||||
| <30 years | 388 | 24.3 | 4.5 | 19.8 | 0.05 | 19.3–20.3 |
| ≥30 years | 271 | 28.9 | 4.5 | 24.4 | 0.21 | 23.5–25.3 |
| Marital status | ||||||
| Single* | 542 | 25.3 | 4.5 | 20.8 | 0.05 | 20.3–21.3 |
| Married | 117 | 30.4 | 4.5 | 25.9 | 0.64 | 24.3–27.5 |
| Residence | ||||||
| Beijing | 182 | 25.6 | 4.5 | 21.1 | 0.23 | 20.2–22.0 |
| Non-Beijing | 477 | 26.5 | 4.5 | 22.0 | 0.08 | 21.4–22.6 |
| Length of residence in Beijing | ||||||
| <2 years | 116 | 25.8 | 4.5 | 21.3 | 0.33 | 20.2–22.4 |
| ≥2 years | 543 | 26.3 | 4.5 | 21.8 | 0.08 | 21.3–22.3 |
| Ethnicity | ||||||
| Han | 613 | 26.3 | 4.5 | 21.8 | 0.07 | 21.3–22.3 |
| Minorities | 45 | 25.1 | 4.5 | 20.6 | 0.81 | 18.8–22.4 |
| Education | ||||||
| High school or below | 282 | 26.9 | 4.5 | 22.4 | 0.19 | 21.5–23.3 |
| College or above | 377 | 25.8 | 4.5 | 21.3 | 0.08 | 20.7–21.9 |
*Single including those who has never married, divorced, or widowed; n: Number of participants answering the question; : Mean of the responses that participants entered for the age at first homosexual encounter; μc: Mean of the digits on the coins in the cloth bag; and Var(): Estimated mean and its variance of the actual age at first homosexual encounter; CI: Confidence interval.