Perfluoroalkyl acids and time to pregnancy revisited: An update from the Danish National Birth Cohort

Table 1 Participant characteristics for women from two samples of the Danish National Birth Cohort

Abbreviations: Perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS), Body Mass Index (BMI), socio-economic status (SES)
Medians are listed for continuous variables and percentages for categorical variables. Infertility was defined as a time to pregnancy >12 months or receiving infertility treatment
SES definitions: Higher SES includes women with managerial posts and/or a job requiring a long or medium-cycle higher education. Middle/lower SES includes women who have a job requiring a shorter education, who do not have an education, or who do not have a job
Missing values: One for age in Sample 2, none in Sample 1. None for parity in Sample 2 and one in Sample 1. For BMI 33 values were missing for Sample 2, and six values were missing for Sample 1. For SES, four values were missing for Sample 2, and two for Sample 1. Nine women from Sample 2 and three women from Sample 1 with planned pregnancies had missing time to pregnancy. One woman from Sample 2 had missing data on both planner status and time to pregnancy

ISSN: 1476-069X