In addition, given that FSH and amenorrhea levels are positively correlated and that these data were also available at year 1, the chance was examined by us of either amenorrhea or postmenopausal degrees of FSH at year 2, as well as at year 1 or 2 2. We analyzed patient features according to randomization group. To assess whether lacking data influenced the results for the principal analysis, we also evaluated the association between treatment and stratification variables according to status regarding follow-up data .The analysis drugs were prepared by workers who were alert to the study-group assignments but weren’t involved in study assessments. Mepolizumab and placebo were identical in appearance and were administered by an employee member who was unaware of the study-group assignments. Information regarding research measurements and procedures are provided in the Supplementary Appendix, offered by NEJM.org. Primary End result The primary outcome was the annualized frequency of significant exacerbations clinically, which were defined as worsening of asthma such that the treating physician elected to manage systemic glucocorticoids for at least 3 times or the individual visited an emergency division or was hospitalized.15 Exacerbations were confirmed by objective changes that sufferers recorded daily in an electronic diary .