Table 3:

Odds of having a severe or any adverse event within 42 days after a surgically induced abortion in relation to the volume of surgically induced abortion procedures performed by that physician in the preceding year being less than the 10th versus the 10th percentile or more (Analysis 2, main model)

Outcome	Physician surgical IA procedure volume	No. (%) of women with an adverse outcome	Event rate per 1000 procedures (95% CI)	Crude OR (95% CI)*	Adjusted OR not accounting for clustering effect (95% CI)†	Adjusted OR accounting for clustering effect (95% CI)‡
Severe adverse event§	≥ 10th percentile n = 476 252	656 (0.1)	1.4 (1.3–1.5)	1.00 (Ref)	1.00 (Ref)	1.00 (Ref)
	< 10th percentile n = 52 889	194 (0.4)	3.7 (3.2–4.2)	2.67 (2.27–3.13)	1.94 (1.60–2.34)	1.91 (1.41–2.59)
Any adverse event¶	≥ 10th percentile n = 476 252	4596 (1.0)	9.7 (9.4–9.9)	1.00 (Ref)	1.00 (Ref)	1.00 (Ref)
	< 10th percentile n = 52 889	1068 (2.0)	20.2 (19.0–21.4)	2.12 (1.98–2.26)	1.43 (1.32–1.54)	1.19 (1.02–1.40)

Note: ADG = Aggregated Diagnosis Group, CI = confidence interval, IA = induced abortion, ICU = intensive care unit, OR = odds ratio, Ref = referent.

^*Results from univariable logistic regression models.

^†Results from multivariable logistic regression models, adjusted for women’s age, rural or urban residence, neighbourhood income quintile, world region of origin, nulliparous status, number of previous IAs, total number of adjusted 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.

^‡Results from multivariable logistic regression models, with generalized estimating equations applied to account for multiple IA procedures clustered within the same physician. Adjusted for women’s age, rural or urban residence, neighbourhood income quintile, world region of origin, nulliparous status, number of previous IAs, total number of adjusted 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.

^§Comprises any of the following: maternal end organ damage, severe maternal morbidity, admission to ICU or death.

^¶Comprises any of the following: hemorrhage, infection, retained products of conception, other, transfusion of red cell bloods, maternal end organ damage, severe maternal morbidity, admission to ICU or death.