Mean (95% CI) differences in HIV-1 RNA concentration at viral set-point (log<sub>10</sub> copies/ml) according to time of seroconversion.

a<p>Homogeneous patient group: MSM from W-Europe/N-America. Patients with non-B subtype infection excluded.</p>b<p>Adjusted for gender, region of origin, subtype, age at seroconversion, HIV transmission group, interval between seroconversion and viral set-point, and presence of a resistance mutation.</p>c<p>Adjusted for availability of subtype data.</p>