Table 1 Characteristics of participants stratified by maternal marital status (n = 82,462)
Variables | Unmarried | Married |
|---|---|---|
(single, divorced, widowed) | (or de facto marriage) | |
n = 3188 | n = 79,274 | |
Maternal age at pregnancy | ||
Mean (SD) | 26.8 (6.1) | 31.1 (4.8) |
24 or under (%) | 1335 (41.9) | 6927 (8.7) |
25 ~ 29 (%) | 859 (26.9) | 23,300 (29.4) |
30 ~ 34 (%) | 577 (18.1) | 28,993 (36.6) |
35 or over (%) | 417 (13.1) | 20,050 (25.3) |
Data missing (%) | 0 | 4 (0.0) |
Maternal educational level (%) | ||
High school or lower | 1932 (60.6) | 27,391 (34.6) |
Junior college | 911 (28.6) | 32,967 (41.6) |
University or higher | 320 (10.0) | 18,552 (23.4) |
Data missing | 25 (0.8) | 364 (0.5) |
Annual household income (%) | ||
2 million yen or under | 701 (22.0) | 3158 (4.0) |
2 ~ 4 million yen | 1081 (33.9) | 25,122 (31.7) |
4 ~ 6 million yen | 544 (17.1) | 25,279 (31.9) |
6 million yen or over | 361 (11.3) | 20,875 (26.3) |
Data missing | 501 (15.7) | 4840 (6.1) |
Maternal job at pregnancy (%) | ||
Housewife or unemployed | 865 (27.1) | 31,081 (39.2) |
Part-time or self-employed | 1110 (34.8) | 19,403 (24.5) |
Full-time | 1070 (33.6) | 26,316 (33.2) |
Data missing | 143 (4.5) | 2474 (3.1) |
Presence of siblings (%) | ||
Yes | 552 (17.3) | 43,995 (55.5) |
No | 2636 (82.7) | 35,279 (44.5) |
Data missing | 0 | 0 |
Maternal smoking status during pregnancy (%) | ||
Yes | 382 (12.0) | 2688 (3.4) |
No | 2773 (87.0) | 76,103 (96.0) |
Data missing | 33 (1.0) | 292 (0.4) |
Maternal alcohol intake status during pregnancy (%) | ||
Yes | 269 (8.4) | 8062 (10.2) |
No | 2903 (91.1) | 70,920 (89.5) |
Data missing | 16 (0.5) | 292 (0.4) |
Maternal use of folic acid suppl. during pregnancy (%) | ||
Yes | 669 (21.0) | 23,479 (29.6) |
No | 2502 (78.5) | 55,610 (70.1) |
Data missing | 17 (0.5) | 185 (0.2) |
Maternal history of vaccine side effects (%) | ||
Yes | 48 (1.5) | 1009 (1.3) |
No | 3101 (97.3) | 77,821 (98.2) |
Data missing | 39 (1.2) | 185 (0.2) |
Maternal MCS score during pregnancy | ||
Mean (SD) | 44.05 (7.57) | 46.32 (7.22) |
Data missing (%) | 80 (2.5) | 1286 (1.6) |