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Table 2 Estimates of effect of MA use on injecting and sexually risk behaviors in matched and unmatched samples by logistic regression model among PWID, Tehran, 2016–2017

From: Methamphetamine use and HIV risk behavior among men who inject drugs: causal inference using coarsened exact matching

Outcome Unmatched sample OR
(CI 95%)
Matched sample OR (CI 95%)
Condomless sex
 MA users
 MA non-users
2.85; 95% CI 1.57–4.17
1
1.82; 95% CI 1.51–4.10
1
Receptive syringe sharing in past month
 MA users
 MA non-users
1.66 (1.41–1.91)
1
1.36 (1.11–1.85)
1
Distributive syringe sharing in past month
 MA users
 MA non-users
1.51 (1.34–1.86)
1
1.35 (1.15–1.81)
1