Table 3

Behaviour changes and association with the risk of HIV infection between baseline and the last follow-up

Behaviour changes*	HIV infection status (N, %)		Univariate Cox regression analysis			Multivariable Cox regression analysis†
Behaviour changes*	Negative	HIV	HR	95% CI	P value	aHR	95% CI	P value
Change in risk indicators
Lost 2–3 indicators	236 (12.4)	7 (5.5)	0.56	0.25 to 1.27	0.1680	0.57	0.25 to 1.29	0.1822
Lost 1 indicator	525 (27.6)	9 (7.1)	0.41	0.19 to 0.86	0.0182	0.43	0.21 to 0.90	0.0251
No change in indicators	725 (38.1)	30 (23.6)	Reference			Reference
Gained 1 indicator	325 (17.1)	48 (37.8)	2.82	1.78 to 4.46	0.0001	2.67	1.68 to 4.24	0.0001
Gained 2–3 indicators	91 (4.8)	33 (26.0)	6.13	3.73 to 10.08	0.0001	4.99	3.00 to 8.31	0.0001
Behaviour transition type
Consistently protective	318 (16.7)	2 (1.6)	Reference			Reference
Protective to moderate	210 (11.0)	11 (8.7)	4.78	1.18 to 19.26	0.0275	4.79	1.18 to 19.47	0.0283
Protective to fragile	77 (4.0)	25 (19.7)	28.76	7.66 to 108.05	0.0001	23.03	6.02 to 88.13	0.0001
Moderate to protective	301 (16.0)	1 (0.8)	0.64	0.08 to 5.03	0.6703	0.65	0.08 to 5.16	0.6912
Consistently moderate	315 (16.6)	4 (3.1)	1.62	0.33 to 7.84	0.5449	1.52	0.31 to 7.41	0.6019
Moderate to fragile	109 (5.7)	33 (26.0)	34.32	9.27 to 127.06	0.0001	25.48	6.79 to 95.40	0.0001
Fragile to protective	219 (11.5)	7 (5.5)	2.95	0.68 to 12.67	0.1457	2.87	0.66 to 12.46	0.1590
Fragile to moderate	237 (12.5)	7 (5.5)	3.06	0.71 to 13.17	0.1316	2.66	0.61 to 11.53	0.1906
Consistently fragile	116 (6.1)	37 (29.1)	31.43	8.53 to 115.75	0.0001	25.86	6.92 to 96.57	0.0001
Total	1902	127

*Two time points (baseline and the last follow-up) were opted to evaluate behaviour changes.
†Multivariable Cox regression analysis was adjusted for age, education, marital status, residence time in Tianjin and MSW.
aHR, adjusted HR; MSW, male sex worker.