Cox proportion hazard regression modelling outcome: CD4≤250, WHO clinical stage 4 and death.

&<p>With subtype A as baseline.</p>&&<p>Baseline CD4 counts scaled by 100.</p>*<p>Analysis for WHO stage and death outcomes not done for the ART period: there were only three events.</p

Characteristics of HIV-1 incident cases in the cohort: 1990–2010.

*<p>one-sided two sample test of proportion.</p>+<p>one-sided t-test.</p>&<p>Kruskal-Wallis test.</p

HIV-1 subtype distribution in env, gag, pol and combined regions; and virological and immunological status of HIV-1 incident cases at enrolment.

&&<p>Proportion of subtype D is greater than that of A (p<0.01) and of A/D (p<0.01).</p><p>+one-sided t-test; subtype A – baseline.</p>&<p>Kruskal-Wallis test.</p