Figure 2From: Strategies for monitoring and evaluation of resource-limited national antiretroviral therapy programs: the two-phase design Estimated post-hoc power to detect an interaction between clinic type and year of registration under (i) a gold-standard complete data design with patient-level data on all N = 82,877 patients; (ii) a case–control design; (iii) a two-phase design, stratifying on clinic type; and, a two-phase design, stratifying on clinic type and year of registration. Back to article page