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. Author manuscript; available in PMC: 2012 Dec 5.
Published in final edited form as: J AIDS Clin Res. 2012 Sep 24;3(7):171. doi: 10.4172/2155-6113.1000171

Table 4.

Propensity score matching estimates of the impact of food assistance on adherence after six months.

Overall estimates Intervention group (n=133) Control group (n=147) Mean difference (95% CI) Standard error t-statistic p-value
Before Matching
Medication possession ratio		 97% 96% 0.07% (−0.002, 1.4) 0.01 0.66 0.51
Intervention group (n=61) Control group (n=107) Mean difference (95% CI) Standard error t-statistic p-value
After matching
Medication possession ratio		 98% 89% 9.5% (4.9, 14.0) 0.02 4.06 <0.01

Total N for unmatched sample for the medication possession ratio is 280 (11 missing observations). Total N for matched sample is 175 reduced to 168 observations after imposing common support (7 treated cases not on support). Overall estimates, N=61 (intervention), 107 (control).