Table 3

Comparison of levels of missing data and internal consistency of response for ICVI and FTFI methods in survey rounds 1 and 2 among sexually experienced men and women aged 15–54 years in Zimbabwe

Risk behaviour	ICVI				FTFI				p Value†
Risk behaviour	Round 1	n*	Round 2	n	Round 1	n	Round 2	n	Round 1	Round 2
*Exclude polygamously married men and illiterate respondents.
†Test for difference between methods after adjustment for age, gender, marital status, socioeconomic location, education level, and recent in-migration.
‡p Value from χ² test.
Missing data	%		%		%		%
Number of partners:
Lifetime‡	1.9	5403	0.1	4587	0.4	1800	0.0	1015	<0.001	0.249
Last year‡	2.0	5403	0.1	4587	0.2	1800	0.0	1015	<0.001	0.415
Last month‡	2.1	5403	0.4	4587	0.4	1800	0.0	1015	<0.001	0.046
Current	2.0	5403	0.1	4587	0.4	1800	0.1	1015	<0.001	0.792
Sex acts with most recent partner in the past month	5.1	3267	5.1	2692	0.9	1058	3.3	608	<0.001	0.079
Condom use with most recent partner in the past month	3.2	3267	5.2	2861	1.0	1058	3.3	608	<0.001	0.081
Most recent partner a regular partner	5.8	3267	5.2	2692	1.3	1058	3.3	608	<0.001	0.087
Inconsistent responses
No sex for more than 1 year but partner in past month	4.0	766	3.3	790	1.4	296	4.1	197	0.026	0.550
New partners exceed total partners in past year	4.1	5403	3.0	4587	2.7	1800	0.2	1015	0.023	<0.001
Current partners exceed lifetime partners	0.8	5403	1.5	4587	0.2	1800	0.6	1015	0.006	0.083
Condoms used exceed sex acts with most recent partner in the past 2 weeks	4.0	3188	2.7	2861	1.7	1055	0.5	645	0.002	0.006
Not commenced sex but had sexual partners in lifetime	–	–	1.7	1697	–	–	1.2	84	–	0.567
Commenced sex but not had any sexual partners in lifetime	–	–	6.4	1779	–	–	10.8	93	–	0.444
Not commenced sex but experienced a pregnancy in the last 3 years	–	–	2.6	1093	–	–	4.8	62	–	0.772