Figure 7From: Evaluation design of a systematic, selective, internet-based, Chlamydiascreening implementation in the Netherlands, 2008-2010: implications of first results for the analysis Detectable differences in prevalences between screening rounds 1 and 2. Power levels are noted on lines, and 4%, 5%, and 6% prevalence rates in screening round 1 (p 0) are presented as a function of the participation rate (sample fraction): A, simulations for Amsterdam, overall and B, comparison of blocks A and C.Back to article page