Table 1 Number (%) of births by birth characteristics and the status of premarital pregnancy

Total

850,536 (100.0)

37,923 (100.0)

Maternal age group

 19 years or less

1,366 (0.2)

4,185 (11.0)

 20–24 years

40,694 (4.8)

12,559 (33.1)

 25–29 years

282,127 (33.2)

10,038 (26.5)

 30–34 years

325,554 (38.3)

6,419 (16.9)

 35–39 years

161,713 (19.0)

3,718 (9.8)

 40 years or more

39,082 (4.6)

1,004 (2.6)

Household occupation

 Farmer

7,983 (0.9)

600 (1.6)

 Self-employed

48,361 (5.7)

3,083 (8.1)

 Full-time worker at a smaller company

257,973 (30.3)

14,876 (39.2)

 Full-time worker at a larger company

444,747 (52.3)

12,343 (32.5)

 Other occupations

71,210 (8.4)

4,618 (12.2)

 Unemployed

4,891 (0.6)

1,252 (3.3)

 Missing

15,371 (1.8)

1,151 (3.0)

Maternal occupation

 Upper non-manual workers

164,661 (19.4)

4,291 (11.3)

 Lower non-manual workers

228,236 (26.8)

8,143 (21.5)

 Manual workers

16,744 (2.0)

904 (2.4)

 Others

409,035 (48.1)

23,083 (60.9)

 Missing

31,860 (3.7)

1,502 (4.0)

Paternal occupation

 Upper non-manual workers

278,740 (32.8)

7,098 (18.7)

 Lower non-manual workers

300,700 (35.4)

12,675 (33.4)

 Manual workers

167,354 (19.7)

12,055 (31.8)

 Others

70,241 (8.3)

4,489 (11.8)

 Missing

33,501 (3.9)

1,606 (4.2)

Sex

 Female

414,859 (48.8)

18,394 (48.5)

 Male

435,677 (51.2)

19,529 (51.5)

Birth weight

 < 2500 g

75,605 (8.9)

4,374 (11.5)

 2500–3999 g

769,282 (90.4)

33,321 (87.9)

 4000 g or more

5,499 (0.6)

214 (0.6)

 Missing

150 (0.0)

14 (0.0)

Gestational age

 36 weeks or less

38,097 (4.5)

2,597 (6.8)

 37 weeks or more

812,303 (95.5)

35,309 (93.1)

 Missing

136 (0.0)

17 (0.0)

Year

 2010

294,737 (34.7)

13,654 (36.0)

 2015

300,031 (35.3)

13,909 (36.7)

 2020

255,768 (30.1)

10,360 (27.3)