Baseline characteristics of treatment-naïve, HIV-infected children receiving care at Macha Hospital, Zambia from 2007–2010.

<p>ART: antiretroviral treatment ; IQR: interquartile range; PMTCT: prevention of mother-to-child transmission; WAZ: weight-for-age z-score; WHO: World Health Organization.</p>a<p>Among children <10 years of age.</p>b<p>Defined by age for all children according to the 2006 WHO guidelines.</p>c<p>Defined retrospectively according to the WHO treatment guidelines in effect at the time of study enrollment.