Table 2 Maternal background characteristics by socioeconomic status (SES)
From: Maternal socioeconomic status and the risk of asthma among offspring
Total n(%) | Upper white-collar worker n(%) | Lower white-collar worker n(%) | Blue-collar worker n(%) | Other n(%) | Missing n(%) | p value | |
|---|---|---|---|---|---|---|---|
Maternal age, years | |||||||
<20 | 1315(3.3) | 10(0.2) | 125(0.8) | 196(2.4) | 788(8.5) | 196(8.4) | |
20-29 | 20 979(52.3) | 2087(36.4) | 7426(50.3) | 4629(57.8) | 5658(60.9) | 1179(50.7) | |
30-39 | 16 559(41.3) | 3406(59.4) | 6728(45.6) | 2942(36.8) | 2617(28.2) | 866(37.3) | |
≥40 | 1265(3.2) | 231(4.0) | 484(3.3) | 238(3.0) | 229(2.5) | 83(3.6) | <0.001 |
Asthma | 1129(2.8) | 136(2.4) | 438(3.0) | 172(2.1) | 285(3.1) | 98(4.2) | <0.001 |
Hypertension | 790(2.0) | 94(1.6) | 325(2.2) | 158(2.0) | 169(1.8) | 44(1.9) | 0.074 |
ART1 | 1656(4.1) | 327(5.7) | 717(4.9) | 304(3.8) | 244(2.6) | 64(2.8) | <0.001 |
Infertility (own opinion) | 2290(5.7) | 489(8.5) | 971(6.6) | 428(5.3) | 316(3.4) | 86(3.7) | <0.001 |
Pre-pregnancy BMI2, kg/m2 | |||||||
<25 | 27 377(71.3) | 4232(76.7) | 10 140(71.2) | 5180(67.4) | 6439(72.1) | 1386(69.2) | |
25-29.9 | 7 585(19.8) | 975(17.7) | 2871(20.2) | 1690(22.0) | 1659(22.0) | 390(19.5) | |
≥30 | 3 410(8.9) | 310(5.6) | 1227(8.6) | 815(10.6) | 831(9.3) | 227(11.3) | <0.001 |
Marital status | |||||||
Unmarried | 4 212(10.5) | 360(6.3) | 1364(9.2) | 1038(13.0) | 1110(11.9) | 340(14.6) | |
Married or cohabiting | 35 906(89.5) | 5374(93.7) | 13 399(90.8) | 6967(87.0) | 8182(88.1) | 1984(85.4) | <0.001 |
Mean number of deliveries3 | 1.0(1.3) | 1.0(1.2) | 1.0(1.1) | 1.0(1.2) | 1.3(1.6) | 0.9(1.3) | <0.001 |
Mean number of pregnancies3 | 1.4(1.6) | 1.3(1.5) | 1.4(1.4) | 1.4(1.5) | 1.7(2.0) | 1.4(1.6) | <0.001 |
Mean numbers of miscarriages3 | 0.2(0.6) | 0.2(0.6) | 0.2(0.5) | 0.2(0.5) | 0.2(0.6) | 0.2(0.6) | 0.004 |
Mean number of artificial abortions3 | 0.1(0.4) | 0.1(0.3) | 0.1(0.4) | 0.2(0.5) | 0.1(0.4) | 0.2(0.4) | 0.001 |
Surgically scarred urerus | 3590(8.9) | 513(8.9) | 1325(9.0) | 776(9.7) | 831(8.9) | 145(6.2) | <0.001 |
Total | 40 118(100) | 5734(14.3) | 14 763(36.8) | 8005(20.0) | 9292(23.2) | 2324(5.8) |