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. Author manuscript; available in PMC: 2015 Aug 15.
Published in final edited form as: J Acquir Immune Defic Syndr. 2014 Aug 15;66(0 3):S285–S292. doi: 10.1097/QAI.0000000000000241

Table 1.

Discrepancy between 2 reports of ever having had sex in published studies

Reference Population Time
Interval
Between
Measures		 % of those who said
they had sex at Time 1
who said they hadn’t at
Time 2		 Sample
Size		 95%
Confidence
Interval
3 US 9th and 10th graders 1 year 9.7% 1886 8.4%, 11.0%
4 US 7th to 12th graders* 1 year 11.2% 3855 10.2%, 12.2%
5 US 7th to 12th graders* 1 year 10.7% 3855 9.7%, 11.7%
6 South African 8th to 10th graders 4–6 months 16% (average over 4 time intervals) 713 13.3%, 18.7%
7 US 9th to 12th graders 2 weeks 4.1% 4619 3.5%, 4.7%
*

Same dataset, slightly different analyses