Table 2. Mean BMI in groups of children born before and after maternal bariatric surgery, assessed with linear GEE regression.

	Before surgery			After surgery			GEE regression (adj1)
Age group (n)	n	Mean BMI (crude)	Mean BMI (adj1)	n	Mean BMI (crude)	Mean BMI (adj1)	Diff	95% CI	p
All 4-year-olds (340)	164	16.9	16.8	176	17.1	17.2	0.46	−0.12; 1.03	0.117
4-year-old girls (155)	87	17.1	16.9	68	17.0	17.3	0.41	−0.76; 1.58	0.494
4-year-old boys (185)	77	16.6	16.6	110	17.2	17.2	0.60	−0.01; 1.11	0.088
All 6-year-olds (340)	171	17.5	17.2	169	17.8	18.1	0.87	−0.08; 1.82	0.072
6-year-old girls (157)	91	17.6	17.7	66	17.7	17.9	0.27	−1.01; 1.55	0.681
6-year-old boys (183)	80	17.0	16.7	103	17.9	18.1	1.33	−0.03; 2.68	0.055
All 10-year-olds (272)	157	20.6	20.3	111	21.6	21.9	1.61	0.09; 3.12	0.038
10-year-old girls (128)	86	20.6	20.5	42	22.1	22.4	1.90	−0.20; 4.00	0.077
10-year-old boys (144)	73	20.5	20.1	71	21.3	21.8	1.60	−0.72; 3.93	0.177

Adjusted for maternal age, maternal self-reported education, child's birth year and birth order. ¹