Figure 1.

Flow diagram for availability of biomarker data among START participants. ^*Of 4487 participants who consented to storing specimens for future research. Of the 319 participants (149 in the immediate group and 170 in the deferred group) who had biomarker data at baseline but not month 8, 7 had died and 44 were lost to follow-up prior to month 8, 145 missed the month 8 visit, 65 attended the visit but no specimen was collected, and for 59 participants the specimen could not be analyzed. The distribution of reasons was similar in the immediate and deferred groups.