Variable | Reference | Selection model | Outcome model | ||||||
β | P values | 95% CI | β | P values | 95% CI | ||||
Lower | Upper | Lower | Upper | ||||||
Area | |||||||||
Shanghai | Beijing | – | – | – | – | −0.20 | 0.000 | −0.31 | −0.09 |
Chongqing | −1.15 | 0.000 | −1.37 | −0.93 | – | – | – | – | |
Age (years) | |||||||||
20–29 | <20 | 0.73 | 0.000 | 0.37 | 1.09 | – | – | – | – |
30–39 | 1.13 | 0.000 | 0.75 | 1.51 | – | – | – | – | |
40–49 | 1.03 | 0.000 | 0.65 | 1.41 | – | – | – | – | |
Educational attainment | |||||||||
Junior high school | Elementary school or lower | – | – | – | – | – | – | – | – |
High school | −0.57 | 0.000 | −0.88 | −0.25 | – | – | – | – | |
Junior college | −0.72 | 0.000 | −1.07 | −0.36 | – | – | – | – | |
College or higher | −0.83 | 0.000 | −1.20 | −0.45 | – | – | – | – | |
Occupation | |||||||||
Service worker | Labourer | – | – | – | – | 0.15 | 0.0111 | 0.03 | 0.26 |
Length of the first migration up to now (year) | |||||||||
3–6 | <3 | 0.39 | 0.000 | 0.18 | 0.59 | ||||
6–10 | 0.40 | 0.000 | 0.20 | 0.60 | – | – | – | – | |
≥10 | 0.51 | 0.000 | 0.31 | 0.72 | 0.19 | 0.0116 | 0.04 | 0.34 | |
Residence pattern currently | |||||||||
Renting independently | Dormitory | 0.33 | 0.000 | 0.16 | 0.50 | 0.12 | 0.0441 | 0.003 | 0.24 |
Joint renting | 0.41 | 0.000 | 0.23 | 0.59 | 0.16 | 0.0146 | 0.03 | 0.28 | |
Self-owned house | 0.59 | 0.000 | 0.35 | 0.83 | 0.27 | 0.0001 | 0.11 | 0.44 | |
Other | 0.63 | 0.0213 | 0.09 | 1.16 | – | – | – | – | |
Length of living with spouse/sexual partner per year (month) | |||||||||
1–6 | <1 | – | – | – | – | 0.54 | 0.000 | 0.30 | 0.79 |
7–12 | −0.67 | 0.0025 | −1.10 | −0.23 | 0.66 | 0.000 | 0.42 | 0.90 | |
Age at first intercourse (years) | |||||||||
≥30 | <10 | −0.66 | 0.0001 | −1.16 | −0.16 | – | – | – | – |
Relationship with the first intercourse partner* | |||||||||
Other | Lover | −0.61 | 0.000 | −0.92 | −0.30 | −0.43 | 0.0007 | −0.68 | −0.18 |
Communication frequency with spouse/sexual partner on sex* | |||||||||
Usually | Rarely | – | – | – | – | −0.15 | 0.0198 | −0.27 | −0.02 |
Actual number of children* | |||||||||
1 | 0 | −0.74 | 0.000 | −1.10 | −0.38 | 1.01 | 0.000 | 0.86 | 1.14 |
2 | – | – | – | – | 0.77 | 0.000 | 0.63 | 0.93 | |
≥3 | −1.23 | 0.000 | −1.57 | −0.68 | 0.74 | 0.000 | 0.50 | 0.99 | |
Score on knowledge on contraception* | – | – | – | – | 0.002 | 0.0333 | 0.002 | 0.004 | |
Score on knowledge on SRH* | 0.007 | 0.000 | 0.004 | 0.010 | 0.006 | 0.000 | 0.004 | 0.008 | |
Athrho | −0.27 | 0.2661 | |||||||
Rho | −0.26 | 0.3015 |
*Controlled for area, occupation, length of the first migration up to now, current residence pattern, length of living with the spouse/sexual partner per year and age at first intercourse.
SRH, sexual and reproductive health.