TABLE 2.

Reporting of sexual behavior by interview mode, São Paulo, Brazil, 2004^‡

	Estimate		Sample size
	ACASI§	FTF§	ACASI	FTF
Among all women
% With a sexual partner in the last 6 months	92	94	409	409
Mean no. of sexual partners in the last 6 months	1.6	1.3	409	408
Sexual behavior among those with partners in the last 6 months
Mean no. of vaginal sex acts in the last month	7.9	8.2	378	385
% Having vaginal sex within the last month	83	90**	378	385
% Having oral sex within the last 6 months	67†	60	355	382
% Having anal sex within the last 6 months	33**	24	355	383
% Consuming alcohol or using drugs prior to the last sex act	28	27	373	381
% With overlapping sexual partners in the last 6 months	20	17	376	385
% Exchanged sex for money, drugs, or favors in the last 6 months	4	3	376	385
% With a partner in the last 6 months who has been in prison	8	6	365	384
Unprotected sex among those having [type of] sex in the last 6 months
% Having at least one vaginal sex act without a condom in the last 6 months¶	81	77	364	384
% Not currently using a male or female condom to prevent pregnancy¶	52	46	377	385
% Not using a condom during last vaginal sex¶	67	63	375	385
% Not using a condom during last oral sex¶	90†	84	236	228
% Not using a condom during last anal sex¶	69	61	122	93
% Having at least one vaginal sex act without a condom in the last month¶#	78	73	311	348
% Never using a condom during vaginal sex in the last month¶#	59*	51	311	348
Mean no. of sex acts without a condom in the last month¶#	7.0*	5.8	311	348
Risk combinations among those having [type of] sex in the last 6 months
% Not using a condom during last vaginal sex and not using a condom during last oral sex¶‡‡	69	62	236	228
% With a partner in the last 6 months who has been in prison and not using a condom during vaginal sex¶‡‡	6	4	363	384
% Consuming alcohol or using drugs prior to sex, having overlapping partners, and not using a condom during last vaginal sex¶‡‡	6	8	308	345

*p < 0.05; **p < 0.01: significance level across interview mode.

^†p < 0.10: significance level across interview mode.

^‡Sample estimates are unadjusted for the demographic characteristics listed in table 1. Analysis (not shown) revealed insignificant differences from adjusted results.

^§ACASI, audio computer-assisted self-interviewing; FTF, face-to-face.

^¶Asked only of those reporting having had this type of sex; male or female condom not explicitly distinguished.

^#These indicators were generated from two questions asked about each of three partners: the number of vaginal sex acts in the last month with that partner and the number of vaginal sex acts without a condom in the last month with that partner.

^‡‡These variables were generated by using combinations of other measures in the table and hence are not mutually exclusive from them.