Does Menstruation Explain Gender Gaps in Work Absenteeism?
检验了Ichino和Moretti（2009）关于月经周期导致女性缺勤增加的观点，发现其证据不稳健，并指出五天工作周可能造成28天周期的假象。
Ichino and Moretti (2009) find that menstruation may contribute to gender gaps in absenteeism and earnings, based on evidence that absences of young female Italian bank employees follow a 28-day cycle. We find this evidence is not robust to the correction of coding errors or small changes in specification, and we find no evidence of increased female absenteeism on 28-day cycles in data on school teachers. We show that five day work weeks can cause misleading group differences in absence hazards at multiples of seven, including 28 days, and illustrate this problem by comparing absence patterns of younger males to older males.