Table 3 HIV incidence by study period before and after propensity score matching.

From: Use of propensity score matching to create counterfactual group to assess potential HIV prevention interventions

Period

Status

SiVET

Non-SiVET

Incidence rate ratio (95% CI)

p-value

HIV + 

PYAR

Incidence (95% CI)

HIV + 

PYAR

Incidence (95% CI)

Concurrent

Before PSM

17

484.9

3.5 (2.2–5.6)

39

658.1

5.9 (4.3–8.1)

0.59 (0.31–0.68)

0.033

After PSM

16

386.0

4.1 (2.5–6.8)

20

428.1

4.7 (3.0–7.2)

0.89 (0.43–1.80)

0.364

Pre-SiVET

Before PSM

17

484.9

3.5 (2.2–5.6)

105

2309.7

4.5 (3.8–5.5)

0.77 (0.43–1.29)

0.161

After PSM

17

484.9

3.5 (2.2–5.6)

18

436.1

4.1 (2.6–6.6)

0.85 (0.41–1.75)

0.316

  1. PSM propensity score matching, CI confidence interval, PYAR person years at risk.