Table 3.

Reported presenteeism caused by menstruation-related symptoms

	Number (percentage)	Mean±SD	Median
All (n=32 748)
Presenteeism	26 438 (80.7)
Number of days in the past 3 months		5.8±5.3	5.0
Percentage of productivity loss per day		33.0±24.8	30.0
Days/year of lost productivity		8.9±11.0	5.6
Work (n=26 104)
Presenteeism	21 252 (81.4)
Number of days in the past 3 months		5.7±5.2	5.0
Percentage of productivity loss per day		31.7±24.7	30.0
Days/year of lost productivity		8.4±10.6	4.8
Study (n=8764)
Presenteeism	7385 (84.3)
Number of days in the past 3 months		6.3±5.3	5.0
Percentage of productivity loss per day		36.8±24.2	40.0
Days/year of lost productivity		10.5±11.8	7.2

Women were asked to report the amount of days on which they were less productive and to what extent. The total days of lost productivity per year was calculated. The added numbers of women in the work and study group exceed the total amount of participants, since 2120 women reported to both study and work more than 5 hours/week.

Note that the values presented in days/year of lost productivity do not add up exactly, since these data were calculated on an individual basis and are not the result of merely multiplying the two averages.