Table 3.

Changes in Risk Behavior Over Time Among Injection Drug Users Enrolled in the Madras Injection Drug Users and AIDS Cohort Study, Chennai, India, 2005–2009

Behaviora	6 Months vs. 0 Months (n = 628)		12 Months vs. 0 Months (n = 546)		24 Months vs. 12 Months (n = 500)
	ORb	95% CI	ORb	95% CI	ORb	95% CI
Injecting any drug	0.02	0.01, 0.04	0.01	0.004, 0.03	0.28	0.10, 0.67
Any noninjection drug use	0.31	0.22, 0.45	0.28	0.19, 0.40	0.97	0.69, 1.37
Sharing needlesc	0.71	0.28, 1.73	0.11	0.003, 0.80	NCd
Injecting at a dealer's housec	0.38	0.22, 0.66	NC		NC
Cleaning needlesc	1.02	0.84, 1.23	0.94	0.60, 1.50	NC
Any sexual intercourse	1.05	0.78, 1.42	0.91	0.68, 1.22	1.22	0.85, 1.76
Condom use with a regular partnere	1.00	0.27, 3.74	0.50	0.08, 2.34	0.67	0.06, 5.82
Sex with a nonregular partner	0.68	0.46, 0.99	0.56	0.37, 0.84	1.11	0.69, 1.79
Condom use with a nonregular partnerf	2.17	0.77, 6.95	3.33	0.86, 18.85	2.00	0.29, 22.11
Exchanging money/drugs for sex	0.95	0.61, 1.50	0.73	0.45, 1.18	1.15	0.66, 2.00
Alcohol use >2 times/week	1.28	0.99, 1.67	2.40	1.83, 3.16	3.14	2.05, 4.95

Abbreviations: AIDS, acquired immunodeficiency syndrome; CI, confidence interval; NC, not calculated; OR, odds ratio.

^aAll behaviors were self-reported and represented behaviors engaged in during the month prior to the interview.

^bMatched-pair odds ratio calculated using conditional logistic regression.

^cData were restricted to participants who reported injecting drugs during the prior month at both time points.

^dNot calculated because too few people reported these behaviors at the 12-/24-month visit.

^eData were restricted to participants who reported having had sex with a regular partner.

^fData were restricted to participants who reported having had sex with a nonregular partner.