150 Chapter 7 RESULTS A total of 3992 patients in the LHC database were screened for study participation, of which 554 met inclusion criteria. A flowchart of participant selection is available in Figure 1. Figure 1: Flowchart of participant selection All women collectively completed daily headache e-diaries of 2522 menstrual cycles with a mean cycle length of 27·3 ± 2·6 days. The median follow-up time of all participants was 80 days with a median e-diary adherence of 99%. The WHAT-hormone subgroup contained 31 women with e-diaries of 58 menstrual cycles and a mean cycle length of 27·5 ± 3·4 days. In this subgroup, median follow-up was 52 days with median adherence of 100%. Baseline characteristics of the study population are shown in Table 1.
RkJQdWJsaXNoZXIy MjY0ODMw