Table 2. Number of HIV-positive and HIV-negative MSM that declined to answer specific questions about their sexual history during CASI.

	HIV-positive			HIV-negative
Questions asked by CASI	n	N	%	n	N	%	p-value a
Do you have a male RSP	1	41	2.4	51	3172	1.6	0.84
RSP condom use RAS	0	17	0.0	34	1310	2.6	0.59
RSP condom use IAS	0	17	0.0	36	1310	2.8	0.56
How many CSPs have you had in the last 12 mths	14	41	34.2	272	3030	9.0	<0.001
Have you had anal sex with CSPs	4	39	10.3	44	3030	1.5	<0.001
CSP condom use RAS	4	34	11.3	56	2489	2.3	0.002
CSP condom use IAS	6	34	17.7	73	2489	2.9	<0.001

^aChi square test for differences between HIV-positive and HIV-negative MSM; n  =  of patients who declined the question asked, N  =  number of patients asked the question, RSP  =  regular sexual partner, CSP  =  casual sexual partner, RAS  =  receptive anal sex, IAS  =  insertive anal sex.