Background
Methods
Participants and recruitment
Interview procedures
Measures
Ego-network data collection
Social tie strength (STS)
Condomless anal intercourse
Occasional sexual partners
Place of first date
Method of meeting sexual partners
Statistical analyses
Social network analysis
Mixing matrices
Chi square test
Regression analysis
Results
Demographic characteristics of the study respondents and their sexual partners
Characteristics | Socio-demographics of the respondents (N = 1073) | Socio-demographics of the sexual partners (N = 2667) | ||
---|---|---|---|---|
n
| % |
n
| % | |
Age group | ||||
≤ 17 | 0 | 0 | 25 | 0.94 |
18–25 | 430 | 40.07 | 1053 | 39.48 |
26–30 | 305 | 28.43 | 911 | 34.16 |
31–40 | 243 | 22.65 | 487 | 18.26 |
41–50 | 79 | 7.36 | 146 | 5.47 |
> 51 | 16 | 1.49 | 45 | 1.69 |
Education background | ||||
Primary school | 1 | 0.09 | 13 | 0.49 |
Middle school | 100 | 9.32 | 206 | 7.72 |
High school | 202 | 18.83 | 539 | 20.21 |
Undergraduate school | 669 | 62.35 | 1540 | 57.74 |
Master’s or above | 101 | 9.41 | 198 | 7.42 |
Unknown | 0 | 0 | 171 | 6.41 |
Marital status | ||||
Married | 142 | 13.23 | 467 | 17.51 |
Unmarried | 903 | 84.16 | 2094 | 78.52 |
Divorced | 26 | 2.42 | 71 | 2.66 |
Other | 2 | 0.19 | 35 | 1.31 |
Income (12 months) | ||||
< 20,000 | 287 | 26.75 | 400 | 15.00 |
20,000- | 322 | 30.01 | 689 | 25.83 |
60,001- | 294 | 27.40 | 778 | 29.17 |
120,001- | 136 | 12.67 | 346 | 12.97 |
> 240,000 | 34 | 3.17 | 119 | 4.46 |
Unknown | 0 | 0 | 335 | 12.56 |
Characteristics of the social network of the study respondents and their sexual partners
Social tie strength
Mixing patterns among the study respondents and their sexual partners
Participants characteristic | Total, % | Partners, % | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Non-CAI | CAI | Non-CAI | CAI | Non-CAI | CAI | Non-CAI | CAI | Non-CAI | CAI | Non-CAI | CAI | Non-CAI | CAI | |
Age, y | under 17 | 18–25 | 26–30 | 31–40 | 41–50 | ≥51 | ||||||||
18–25 | 572 (54.22) | 483 (45.78) | 3 (0.52) | 14 (2.9) | 328(57.34) | 268(55.49) | 155 (27.1) | 121(25.05) | 57 (9.97) | 56 (11.59) | 23 (4.02) | 15 (3.11) | 6 (1.05) | 9 (1.86) |
26–30 | 452 (61.33) | 285 (38.67) | 2 (0.44) | 3 (1.05) | 138(30.53) | 103(36.14) | 206 (45.58) | 106(37.19) | 88 (19.47) | 55 (19.3) | 10 (2.21) | 14 (4.91) | 8 (1.77) | 4 (1.4) |
31–40 | 377 (61.90) | 232 (38.10) | 1 (0.27) | 1 (0.43) | 111(29.44) | 48 (20.69) | 145 (38.46) | 105(45.26) | 98 (25.99) | 53 (22.84) | 21 (5.57) | 20 (8.62) | 1 (0.27) | 5 (2.16) |
41–50 | 137 (60.89) | 88 (39.11) | 0 (0.0) | 1 (1.14) | 29 (21.17) | 21 (23.86) | 40 (29.2) | 26 (29.55) | 42 (30.66) | 22 (25.0) | 20 (14.6) | 14 (15.91) | 6 (4.38) | 4 (4.55) |
≥51 | 20 (48.78) | 21 (51.22) | 0 (0.0) | 0 (0.0) | 2 (10.0) | 5 (23.81) | 5 (25.0) | 2 (9.52) | 5 (25.0) | 11 (52.38) | 7 (35.0) | 2 (9.52) | 1 (5.0) | 1 (4.76) |
Education | primary school | middle school | high school | undergraduate school | Master’s and above | unknown | ||||||||
primary school | 1 (100.00) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 1 (100) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
middle school | 131 (49.25) | 135 (50.75) | 1 (0.76) | 4 (2.96) | 43 (32.82) | 49 (36.3) | 36 (27.48) | 33 (24.44) | 32 (24.43) | 27 (20.0) | 2 (1.53) | 4 (2.96) | 17 (12.98) | 18 (13.33) |
high school | 285 (57.11) | 214 (42.89) | 1 (0.35) | 2 (0.93) | 27 (9.47) | 23 (10.75) | 106(37.19) | 90 (42.06) | 118 (41.4) | 74 (34.58) | 16 (5.61) | 10 (4.67) | 17 (5.96) | 15 (7.01) |
undergraduate school | 995 (60.34) | 654 (39.66) | 3 (0.3) | 2 (0.31) | 26 (2.61) | 31 (4.74) | 141(14.17) | 108 (16.51) | 689 (69.25) | 441 (67.43) | 76 (7.64) | 35 (5.35) | 60 (6.03) | 37 (5.66) |
Master’s and above | 146 (57.94) | 106 (42.06) | 0 (0) | 0 (0) | 5 (3.42) | 2 (1.89) | 10 (6.85) | 15 (14.15) | 86 (58.9) | 72 (67.92) | 40 (27.4) | 15 (14.15) | 5 (3.42) | 2 (1.89) |
Income, yuan/year | ≤20,000 | 20,001- | 60,001- | 120,001- | ≥240,001 | unknown | ||||||||
≤20,000 | 377 (53.63) | 326 (46.37) | 124 (32.89) | 111(34.05) | 81 (21.49) | 89 (27.3) | 79 (20.95) | 49 (15.03) | 26 (6.9) | 26 (7.98) | 11 (2.92) | 5 (1.53) | 56 (14.85) | 46 (14.11) |
20,001- | 481 (57.74) | 352 (42.26) | 55 (11.43) | 45 (12.78) | 190 (39.5) | 139(39.49) | 128 (26.61) | 90 (25.57) | 38 (7.9) | 27 (7.67) | 8 (1.66) | 7 (1.99) | 62 (12.89) | 44 (12.5) |
60,001- | 426 (60.51) | 278 (39.49) | 18 (4.23) | 22 (7.91) | 93 (21.83) | 59 (21.22) | 179 (42.02) | 118 (42.45) | 64 (15.02) | 37 (13.31) | 17 (3.99) | 8 (2.88) | 55 (12.91) | 34 (12.23) |
120,001- | 223 (63.90) | 126 (36.10) | 11 (4.93) | 7 (5.56) | 21 (9.42) | 14 (11.11) | 76 (34.08) | 36 (28.57) | 67 (30.04) | 45 (35.71) | 27 (12.11) | 17 (13.49) | 21 (9.42) | 7 (5.56) |
≥240,001 | 51 (65.38) | 27 (34.62) | 5 (9.8) | 2 (7.41) | 3 (5.88) | 0 (0) | 15 (29.41) | 8 (29.63) | 8 (15.69) | 8 (29.63) | 13 (25.49) | 6 (22.22) | 7 (13.73) | 3 (11.11) |
Marital status | Married | Unmarried | Divorced | Separated | other | |||||||||
Married | 204 (56.51) | 157 (43.49) | 83 (40.69) | 82 (52.23) | 112 (54.9) | 62 (39.49) | 4 (1.96) | 9 (5.73) | 3 (1.47) | 0 (0) | 2 (0.98) | 4 (2.55) | ||
Unmarried | 1299 (58.49) | 922 (41.51) | 167(12.86) | 112(12.15) | 1092 (84.06) | 768 (83.3) | 29 (2.23) | 27 (2.93) | 2 (0.15) | 2 (0.22) | 9 (0.69) | 13 (1.41) | ||
Divorced | 51 (62.96) | 30 (37.04) | 17 (33.33) | 5 (16.67) | 33 (64.71) | 24 (80.0) | 1 (1.96) | 1 (3.33) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
Other | 4 (100.00) | 0 (0) | 1 (25.0) | 0 (0) | 3 (75.0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
Mixing patterns and CAI risk (risk factor analysis using a regression model)
Respondents’ characteristics | Odds Ratio of CAI# 95% CI | |||||
---|---|---|---|---|---|---|
Age, yn | ≤17 | 18- | 26- | 31- | 41- | ≥ 51 |
18- | 5.71**(1.62–20.08) | 1.00‡ | 0.96(0.72–1.27) | 1.20(0.80–1.80) | 0.80(0.41–1.56) | 1.84(0.65–5.22) |
26- | 2.92 (0.48–17.71) | 1.45*(1.03–2.05) | 1.00‡ | 1.21 (0.81–1.83) | 2.72*(1.17–6.33) | 0.97(0.29–3.30) |
31- | 1.81 (0.11–29.59) | 0.77 (0.48–1.24) | 1.31 (0.87–1.99) | 1.00‡ | 1.73 (0.86–3.47) | 9.07*(1.07–79.67) |
41- | – | 1.03 (0.43–2.50) | 0.93(0.40–2.16) | 0.75(0.32–1.76) | 1.00‡ | 0.95(0.23–4.01) |
≥51 | – | 2.50 (1.0–62.60) | 0.40 (0.02–10.02) | 2.20 (0.11–42.73) | 0.29 (0.01–6.91) | 1.00‡ |
Education background | Primary school | Middle school | High school | Undergraduate | Master’s and above | Unknown |
Middle school | 3.51(0.38–32.62) | 1.00‡ | 0.80(0.43–1.50) | 0.72(0.37–1.38) | 1.76(0.31–10.06) | 0.93(0.43–2.03) |
High school | 2.36(0.22–51.14) | 1.00(0.53–1.87) | 1.00‡ | 0.74(0.49–1.11) | 0.74(0.31–1.68) | 1.04(0.49–2.20) |
Undergraduate | 1.04(0.14–6.31) | 1.86*(1.09–3.20) | 1.20(0.91–1.58) | 1.00‡ | 0.72(0.47–1.08) | 0.96(0.62–1.47) |
Master’s and above | – | 1.07(0.14–5.56) | 4.00**(1.50–11.16) | 2.23*(1.16–4.47) | 1.00‡ | 1.07(0.14–5.56) |
Marital status | Married | Unmarried | Divorced | |||
Married | 1.00‡ | 0.56**(0.13–0.98) | 2.28(1.06–3.49) | |||
Unmarried | 0.95(0.74–1.23) | 1.00‡ | 1.32(0.77–2.26) | |||
Divorced | 0.31(0.01–8.87) | 0.73(0.03–18.99) | 1.00‡ |
Characteristics of social relationships and CAI risk
Relationship characteristics | Estimate | Z | AORa | 95% CI | P-value | |
---|---|---|---|---|---|---|
STS | ||||||
Weak | 1.00 | |||||
Strong | 0.2706 | 2.65 | 1.31 | 1.07 | 1.60 | 0.008 |
Partner type | ||||||
Regular partner | 1.00 | |||||
Occasional partner | −0.8159 | −7.73 | 0.44 | 0.36 | 0.54 | < 0.0001 |
Method of meeting sexual partners | ||||||
Non-Internet | 1.00 | |||||
Internet | −0.2981 | −2.66 | 0.74 | 0.60 | 0.92 | 0.008 |