Fig. 2
From: Lessons learned from respondent-driven sampling recruitment in Nairobi: experiences from the field
Recruitment of female sex workers, Nairobi 2010–2011 (n = 601 including seeds). Five seeds initiated recruitment and issued 1219 coupons, 632 were returned of which 596 (94.3 %) met eligibility criteria and were enrolled in the study. The median network size was 8 female sex workers (IQR 4–20). The waves of recruitment per seed ranged from 18 to 62. Larger circles indicate seed participants