Table 1.

Sample Size and Determinants of Participation

Panel A: Sample size and attrition
Percent of 1998 adult sample interviewed in 2001		0.78
Percent of 1998 adult sample interviewed in 2004		0.72
Main sample (accepted HIV test with co-variate data)		2,812
Follow-up sample (main sample interviewed at follow-up)		1,524
Percent accepting a test for HIV		0.91
Percent of main sample (Balaka and Rumphi) interviewed at 2004 follow-up survey		0.75
Panel B: Determinants of accepting an HIV test	(1)	(2)
Male	−0.004 (0.009)	−0.002 (0.008)
Age	0.002 (0.003)	0.003 (0.002)
Age-squared	0.000 (0.000)	0.000 (0.000)
Married	−0.02 (0.017)	−0.030** (0.013)
Had a previous HIV test	0.062*** (0.011)	0.047*** (0.010)
Think treatment will become available		−0.012 (0.012)
Think there is a likelihood of being HIV positive		−0.007 (0.010)
Sample size	3,141	2,682
R2	0.01	0.01
Panel C: Determinants of participation in the follow-up survey		(1)
Got results		0.240*** (0.022)
Any incentive		0.068 (0.044)
Amount of incentive		−0.098* (0.056)
Amount of incentive2		0.025 (0.017)
Distance (km)		0.013 (0.047)
Distance2		−0.007 (0.008)
HIV positive		−0.171*** (0.044)
Sample size		2,021
R2		0.09

Notes: Panel B represents one OLS regression of acceptance of an HIV test among those respondents offered a test. Panel C represents one OLS regression among respondents eligible for the follow-up survey (those tested for HIV in Balaka and Rumphi). Controls also include gender, age, and age-squared. Robust standard errors clustered by village with district fixed effects are in parentheses. “Any” is an indicator if the respondent received any nonzero monetary incentive and “amount” is the total value of the incentive.

^***Significantly different from zero at 99 percent confidence level.

^**Significantly different from zero at 95 percent confidence level.

^*Significantly different from zero at 90 percent confidence level.