Figure 1. The Quebec Pregnancy Cohort: linkage between the administrative databases used and the auto-administered questionnaire.

Abbreviations: Rx, prescription filled; MD/ED, medical and emergency department; SES, social economic status; GA, gestational age; BMI, body mass index; OTC, over-the-counter; ICD-9 and ICD-10, International Classification of Diseases, 9^th and 10^th revision; NAM, Numero d'assurance maladie (unique personal identification number).