Results
Of the 23 709 questionnaires begun, only 16 963 provided sufficient responses for analysis, for a completion rate of 71.55%. Of these 16 963 participants, 291 women were pregnant, a figure consistent with the around 800 000 annual births in France for a population of 67 million persons. After exclusion of women without minimal data to calculate the propensity score, 275 pregnant women and 825 non-pregnant women were included and analysed (Figure 1). These pregnant women had a mean age of 31 years (SD = 4.1), and 97% were in a relationship. Most were nulliparous (59%), with a high educational level (63%), and no history of psychiatric disorder, including addiction (83%) (Table 1). These pregnant women had a median WEMWBS score of 49 (Q1-Q3 43.0-54.0), as did the non-pregnant women (Q1-Q3 44.0-54.0) (P = 0.720).
Among pregnant women, suburban living was significantly associated with a lower level of well-being (47 vs. 50 for urban living). Sleep disorders were similarly significantly associated with poorer well-being (45.5 WEMBWS median) as was watching the news for more than an hour a day (47 WEMBWS median; Table 2). Pregnant women who were in relationships, or had a high level of education, or who worked alternately at home and at the office tended to report higher levels of mental well-being, although these differences were not statistically significant.