. Author manuscript; available in PMC: 2011 Aug 15.

Published in final edited form as: J Infect Dis. 2010 Aug 15;202(3):370–373. doi: 10.1086/653706

Table 2.

Odds ratios for mother-to-child transmission of HIV by tertile of erythropoietin (EPO) concentrations in breast milk

	Tertile 1	Tertile 2	Tertile 3	P for trend ^a
Median EPO, mIU/mL (Range)	0.60 (≤0.60 ^b)	2.98 (0.61–6.79)	22.41 (6.80–218.76)
Ratio of the number of controls:cases	41:28	29:18	46:13	0.03
Adjusted OR (95% CI) ^c	1.00	0.71 (0.30, 1.66)	0.34 (0.14, 0.82)	0.02

Wald test for an ordinal variable representing the tertiles of EPO that was introduced as a continuous predictor in univariate (for the unadjusted ratio of controls to cases) and multivariate conditional logistic regression models (for the adjusted odds ratios).

The level of detection of EPO concentrations is 0.6 mIU/mL.

Odds ratios (OR) and 95% CI were derived from conditional logistic regression models with case-control status as the outcome and predictors that included indicator variables for the 2^nd and 3^rd tertiles of EPO, maternal CD4 cell counts and clinical stage of HIV disease at recruitment, and assignment to vitamin A supplementation.