Table 4. Odds ratios (OR) and 95% confidence intervals (CI) for odds of obesity in last-born children by family size.

	Copenhagen School Health Records Register (Obese: ≥95th percentile)						Draft Board (Obese: BMI ≥31.00 kg/m2)
	Crude			Adjusted1,2			Crude			Adjusted1,3
Last-born children* vs.	OR	95% CI	p-value	OR	95% CI	p-value	OR	95% CI	p-value	OR	95% CI	p-value
Any prior born children (n1 = 8 438+16 066, n2 = 361+403)	1.57	[1.40–1.77]	<0.001	1.33	[1.15–1.53]	0.001	1.36	[1.01–1.84]	0.043	1.32	[0.96–1.81]	0.087
Prior born children in families with 2 children (n1 = 6 128+8014, n2 = 198+194)	1.49	[1.29–1.72]	<0.001	1.24	[1.04–1.48]	0.016	1.37	[0.90–2.09]	0.144	1.29	[0.83–1.99]	0.257
Prior born children in families with 3 children (n1 = 1 842+5 536, n2 = 82+138)	1.63	[1.28–2.07]	<0.001	1.47	[1.07–2.00]	0.017	1.72	[0.96–3.09]	0.069	1.64	[0.86–3.13]	0.136
Prior born children in families with 4 children (n1 = 378+1 830, n2 = 36+45)	2.54	[1.71–3.78]	<0.001	1.93	[1.09–3.43]	0.025	1.02	[0.42–2.46]	0.960	1.07	[0.43–2.66]	0.885

^*Excluding only children.

¹Adjusted for birth weight, birth year,

²Adjusted for maternal age when giving birth, sex, maternal BMI (age 13 years),

³Adjusted for father’s social class. n₁ = number in the CSHRR, n₂ = number in the DB.