Table 1 Description of the study population in 2008 and 2014

Gestational diabetes mellitus

n = 2,745 (3.4 %)

n = 3,682 (4.0 %)

Obese (BMI > 30 kg/m²)

n = 8,819 (10.9 %)

n = 11,169 (12.1 %)

Age > 35 years

n = 21,163 (26.1 %)

n = 25,615 (27.7 %)

Migration background

n = 14,401 (17.8 %)

n = 17,772 (19.2 %)

Single mother

n = 7,731 (9.9 %)

n = 6,864 (8.2 %)

Multiparous woman

n = 40,635 (50.1 %)

n = 45,219 (48.8 %)

Smoking during pregnancy

n = 5,457 (6.7 %)

n = 4,262 (4.6 %)

BIMD quintile 1 (least deprived)

n = 10,306 (12.7 %)

n = 12,716 (13.7 %)

BIMD quintile 2

n = 9,679 (11.9 %)

n = 10,329 (11.2 %)

BIMD quintile 3

n = 23,948 (29.5 %)

n = 27,831 (30.1 %)

BIMD quintile 4

n = 13,198 (16.3 %)

n = 14,829 (16.0 %)

BIMD quintile 5 (most deprived)

n = 23,998 (29.6 %)

n = 26,884 (29.0 %)