Table 2. Uni- and multivariate logistic regression analyses with related odds ratios for failing to complete compulsory school after 10 years of education for children born in 1992–1997.

Label	Logistic regression analysis Failing to complete compulsory school (n = 38,478; 10.27%)
	Univariate analysis Odds Ratio (95% CI) n = 374,7981	Multivariate analysis Odds Ratio (95% CI) n = 373,457
Gestational age (weeks) < 28 (n = 483; 0.13%) vs 40	3.21** (2.61–3.94)	2.99** (2.41–3.71)
28–31 (n = 2,214; 0.59) vs 40	2.17** (1.94–2.42)	1.76** (1.56–1.97)
32–34 (n = 5,678; 1.51%) vs 40	1.54** (1.43–1.67)	1.31** (1.20–1.42)
35–36 (n = 12,221; 3.26%) vs 40	1.42** (1.34–1.50)	1.26** (1.18–1.33)
37–38 (n = 56,180; 14.99%) vs 40	1.26** (1.22–1.31)	1.18** (1.14–1.22)
39 (n = 77,849; 20.77%) vs 40	1.09** (1.06–1.13)	1.07** (1.04–1.10)
40 (n = 114,972; 30.68%)	1	1
41 (n = 70,281; 18.75%) vs 40	0.97* (0.94–1.00)	0.97* (0.94–1.00)
> = 42 (n = 34,920; 9.32%) vs 40	1.03 (0.99–1.08)	0.97 (0.93–1.02)
Gender Male (n = 192,665; 51.41%) vs Female	1.60** (1.57–1.63)	1.63** (1.60–1.67)
Section Yes (n = 76,123; 20.31%) vs No	1.18** (1.15–1.21)	1.10** (1.07–1.13)
Multiple births Yes (n = 12,440; 3.32%) vs No	0.96 (0.91–1.02)	0.70** (0.65–0.75)
Birth weight SDS2 -1SDS to -2SDS (n = 52,490; 14%) vs above -1SDS	1.40** (1.36–1.44)	1.30** (1.26–1.34)
-2SDS to -3SDS (n = 11,316; 3.02%) vs above -1SDS	1.98** (1.89–2.08)	1.71** (1.62–1.80)
Below -3SDS (n = 1,878; 0.5%) vs above -1SDS	2.68** (2.40–2.99)	2.14** (1.90–2.41)
Parents education Low (n = 52,021; 13.93%) vs High	5.86** (5.67–6.06)	5.66** (5.48–5.86)
Middel (n = 212,592; 56.93%) vs High	1.94** (1.88–2.00)	1.91** (1.85–1.97)

** p<0.0001

* p<0.05

¹ All analyses included 374,798 children except the analyses regarding parent’s educational level where only 373,457 children were included.

² SDS indicates standard deviation score for birth weight by gestation.