Characteristics Married, n (%) or mean (SD) (n=790 792) Cohabited single n (%) or mean (SD) (n=2941) Non-cohabited single n (%) or mean (SD) (n=3077) P-value
Infant sex:
Male 402 659 (50.9) 1502 (51.1) 1675 (54.4) 0.001
Female 388 133 (49.1) 1439 (48.9) 1402 (45.6)
Mother’s nationality:
Native 765 393 (96.8) 2913 (99.1) 3056 (99.3) <0.001
Foreign 25 399 (3.2) 28 (0.9) 21 (0.7)
Paternal age (years):
Mean 34.2 (4.5) 35.3 (7.1) 32.1 (7.1) <0.001
<20 750 (0.1) 85 (2.9) 206 (6.7) <0.001
20–29 96 449 (12.2) 408 (13.9) 752 (24.5)
30–39 601 377 (76.0) 1669 (56.7) 1709 (55.5)
≥40 92 216 (11.7) 779 (26.5) 410 (13.3)
Maternal age (years):
Mean 31.6 (4.1) 32.1 (6.3) 29.1 (6.5) <0.001
<20 2440 (0.3) 187 (6.4) 331 (10.8) <0.001
20–34 612  (77.5) 1632 (55.5) 2107 (68.5)
≥35 175 (22.2) 1122 (38.1) 639 (20.7)
Area of birth:
Urban 347 755 (44.0) 1279 (43.5) 1383 (45.0) 0.482
Rural 443 037 (56.0) 1662 (56.5) 1694 (55.0)
Place of birth:
Hospital 783 528 (99.1) 2882 (98.1) 3039 (98.8) <0.001
Others 7068 (0.9) 57 (1.9) 38 (1.2)
Paternal education:
College or higher 594 530 (75.4) 1326 (45.7) 1533 (50.5) <0.001
High school or below 194 076 (24.6) 1576 (54.3) 1505 (49.5)
Maternal education:
College or higher 601 231 (76.3) 1374 (47.2) 1572 (51.7) <0.001
High school or below 186 32 (23.7) 1539 (52.8) 1470 (48.3)
Paternal employment:
Manager or specialist 278 891 (35.3) 870 (29.6) 847 (27.5) <0.001
Officer 201 659 (25.5) 383 (13.0) 429 (13.9)
Service 134 327 (17.0) 786 (26.7) 852 (27.7)
Blue collar 155 056 (19.6) 620 (21.0) 562 (18.3)
Unemployed* 20 859 (2.6) 282 (9.7) 387 (12.6)
Maternal employment:
Manager or specialist 128 825 (16.3) 365 (13.5) 416 (13.6) <0.001
Officer 116 176 (14.7) 259 (8.8) 312 (10.1)
Service 45 506 (5.8) 236 (8.0) 281 (9.1)
Blue 16 429 (2.0) 62 (2.1) 77 (2.5)
Unemployed* 483 856 (61.2) 1991 (64.7) 3077 (64.7)
Parity:
Primiparous 413 396 (52.3) 1775 (59.8) 2783 (90.7) <0.001
Multiparous 376 425 (47.7) 1178 (40.2) 286 (9.3)