Stratification of the main model by age, immigrant status, parity, number of previous induced abortion (IA), comorbidity, timing of the IA, physician specialty and location where the IA was performed, presenting the odds of having any adverse event, regardl... Stratification of the main model by age, immigrant status, parity, number of previous induced abortion (IA), comorbidity, timing of the IA, physician specialty and location where the IA was performed, presenting the odds of having any adverse event, regardless of severity (Table 1) within 42 days after a surgically IA performed by a physician whose procedure volume in the previous year was < 10th versus ≥ 10th percentile (the referent) (Analysis 4b). Odds ratios (ORs) were adjusted for age, rural or urban residence, neighbourhood income quintile, world region of origin, nulliparous status, number of previous IAs, total number of adjusted Aggregated Diagnosis Groups (ADGs) in the 2 years before the index IA, gestational age and year when the IA was performed, sex of the physician, physician specialty and number of years since the physician graduated. The interaction terms between physician procedure volume and the timing of induced abortion (p < 0.001), and between physician procedure volume and physician specialty (p = 0.03), were both significant. Note: CI = confidence interval. Ning Liu et al. CMAJ 2019;191:E519-E528 ©2019 by Canadian Medical Association