Table 3

Adverse perinatal outcome by maternal educational level, all births, Denmark, 2000–2009

	RR	95 % CI	aRR	95 % CI
Stillbirth
Primary education	1.39	1.26 to 1.53	1.34	1.21 to 1.48
Vocational education	1.00		1.00
Secondary education	0.84	0.71 to 0.98	0.81	0.69 to 0.94
Short-cycle and medium-cycle higher education	0.89	0.81 to 0.97	0.89	0.81 to 0.98
Long-cycle higher education	0.65	0.57 to 0.74	0.64	0.56 to 0.72
Neonatal mortality
Primary education	1.33	1.16 to 1.51	1.29	1.12 to 1.47
Vocational education	1.00		1.00
Secondary education	0.92	0.76 to 1.13	0.90	0.73 to 1.10
Short-cycle and medium-cycle higher education	0.79	0.70 to 0.90	0.80	0.71 to 0.92
Long-cycle higher education	0.79	0.67 to 0.93	0.79	0.67 to 0.93
Postneonatal mortality*
Primary education	1.93	1.59 to 2.35	1.81	1.47 to 2.22
Vocational education	1.00		1.00
Secondary education	1.02	0.74 to 1.41	0.98	0.71 to 1.36
Short-cycle and medium-cycle higher education	0.74	0.59 to 0.92	0.76	0.61 to 0.95
Long-cycle higher education	0.55	0.41 to 0.75	0.57	0.42 to 0.78
Congenital anomalies
Primary education	1.14	1.09 to 1.18	1.13	1.08 to 1.18
Vocational education	1.00		1.00
Secondary education	0.92	0.86 to 0.98	0.91	0.86 to 0.97
Short-cycle and medium-cycle higher education	0.94	0.90 to 0.97	0.93	0.90 to 0.97
Long-cycle higher education	0.88	0.84 to 0.92	0.87	0.83 to 0.91
Moderate preterm birth, 32+0 to 36+6†
Primary education	1.07	1.04 to 1.10	1.11	1.08 to 1.14
Vocational education	1.00		1.00
Secondary education	0.88	0.84 to 0.92	0.89	0.86 to 0.93
Short-cycle and medium-cycle higher education	0.89	0.87 to 0.92	0.89	0.86 to 0.91
Long-cycle higher education	0.81	0.79 to 0.84	0.80	0.77 to 0.83
Very preterm birth, 28+0 to 31+6†
Primary education	1.06	0.98 to 1.15	1.10	1.01 to 1.20
Vocational education	1.00		1.00
Secondary education	0.89	0.79 to 1.01	0.91	0.81 to 1.03
Short-cycle and medium-cycle higher education	0.83	0.77 to 0.90	0.82	0.76 to 0.89
Long-cycle higher education	0.80	0.73 to 0.88	0.78	0.71 to 0.86
Extreme preterm birth, <28+0†
Primary education	1.36	1.20 to 1.54	1.35	1.19 to 1.54
Vocational education	1.00		1.00
Secondary education	0.79	0.64 to 0.96	0.78	0.63 to 0.96
Short-cycle and medium-cycle higher education	0.77	0.68 to 0.87	0.76	0.67 to 0.86
Long-cycle higher education	0.78	0.67 to 0.91	0.76	0.65 to 0.89
SGA
Primary education	1.32	1.30 to 1.35	1.25	1.22 to 1.28
Vocational education	1.00		1.00
Secondary education	0.99	0.96 to 1.02	0.96	0.93 to 0.99
Short-cycle and medium-cycle higher education	0.82	0.80 to 0.84	0.83	0.82 to 0.85
Long-cycle higher education	0.82	0.80 to 0.84	0.83	0.81 to 0.85

*Compared with children who were alive 365 days after birth.
†Compared with children born from 37+0–41+6.
aRR, risk ratio adjusted for maternal age, maternal country of origin and maternal year of birth; RR, crude risk ratio; SGA, small-for-gestational age.