Table 1. Uni- and multivariate logistic regression analyses with related odds ratios for provision of special educational support for all children registered in the Danish compulsory school in the school-year 2015/2016.

Label	Logistic regression analysis Received special education support (n = 21,762; 3.53%)
	Univariate analysis Odds Ratio (95% CI) n = 615,7891	Multivariate analysis Odds Ratio (95% CI) n = 612,389
Gestational age (weeks) < 28 (n = 930; 0.15%) vs 40	7.18** (6.09–8.48)	6.18** (5.17–7.39)
28–31 (n = 3,798; 0.62) vs 40	3.36** (3.01–3.75)	2.64** (2.35–2.98)
32–34 (n = 9,943; 1.61%) vs 40	2.06** (1.89–2.24)	1.73** (1.58–1.90)
35–36 (n = 19,115; 3.10%) vs 40	1.55** (1.45–1.67)	1.40** (1.30–1.51)
37–38 (n = 89,528; 14.54%) vs 40	1.30** (1.24–1.35)	1.23** (1.18–1.29)
39 (n = 115,369; 18.74%) vs 40	1.10** (1.06–1.15)	1.07* (1.03–1.12)
40 (n = 162,169; 26.34%)	1	1
41 (n = 138,712; 22.53%) vs 40	0.95* (0.91–0.99)	0.97 (0.93–1.01)
> = 42 (n = 76,225; 12.38%) vs 40	1.05 (1.00–1.10)	1.02 (0.97–1.07)
Gender Male (n = 316,215; 51.35%) vs Female	2.75** (2.67–2.84)	2.82** (2.73–2.90)
Section Yes (n = 126,968; 20.62%) vs No	1.22** (1.18–1.26)	1.09** (1.05–1.13)
Multiple births Yes (26,199; 4.25%) vs No	1.04 (0.97–1.11)	0.67** (0.62–0.72)
Birth weight SDS2 -1SDS to -2 SDS (n = 89,586; 14.55%) vs above -1SDS	1.45** (1.40–1.50)	1.35** (1.30–1.40)
-2SDS to -3SDS (n = 16,991; 2.76%) vs above -1SDS	2.33** (2.20–2.48)	1.96** (1.84–2.08)
Below -3 SDS (n = 2,619; 0.43%) vs above -1SDS	4.20** (3.73–4.73)	2.74** (2.41–3.12)
Parents education Low (n = 55,273; 9.03%) vs High	5.68** (5.46–5.92)	5.44** (5.23–5.67)
Middel (n = 296,531; 48.42%) vs High	2.11** (2.04–2.18)	2.06** (1.99–2.14)

** p<0.0001

* p<0.05

¹ All analyses included 615,789 children except the analyses regarding parent’s educational level where only 612,389 children were included.

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