Table 2: Age (mean ± SD) at first sexual intercourse by sociodemographic characteristics.

VariablesCategoryAge at first vaginal sexual intercourseAge at first anal sexual intercourseAge at first sexual intercourse

Present age
<25
≥25
Ethnicity
Han
Minority
Marital status
Married20.88± 3.95
Never married/divorced/widowed
Educational level
≤junior middle school
>junior middle school
Socioeconomic disconnection
Yes
No
Monthly income (RMB)
<2500
≥2500
Length of stay in Shenzhen
<1 month
≥1 month

Analysis of -test, .