Table 1 Demographic characteristics of study population at the first delivery during the study period
Demographic characteristics | Cases n (%) | Controls n (%) | Total N (%) |
|---|---|---|---|
1766 | 77,625 | 79,391 | |
Age, years; mean (SD) | 28.1 (5.9) | 29.2 (5.9) | 29.2 (5.9) |
Age Group | |||
 < 20 years | 142 (8.1) | 4749 (6.1) | 4891 (6.2) |
 21–40 years | 1560 (88.3) | 69,247 (89.2) | 70,807 (89.2) |
 40+ years | 64 (3.6) | 3629 (4.7) | 3693 (4.6) |
Population Groupa | |||
 Israeli-born Jews | 1215 (68.8) | 46,812 (60.3) | 48,027 (60.5) |
 Arabs (excluding Bedouins) | 212 (12.0) | 14,541 (18.7) | 14,753 (18.6) |
 Immigrant from Ethiopia | 47 (2.7) | 1269 (1.6) | 1316 (1.7) |
 Immigrant from FSU | 126 (7.1) | 6847 (8.8) | 6973 (8.8) |
 Bedouins | 52 (2.9) | 2800 (3.6) | 2852 (3.6) |
 Other immigrants | 112 (6.3) | 5327 (6.9) | 5439 (6.9) |
Socio-Economic Statusa; n (%) | |||
 I quarter (1–5) | 497 (28.2) | 18,290 (23.6) | 18,787 (23.7) |
 II quarter (6–9) | 594 (33.7) | 21,577 (27.8) | 22,171 (27.9) |
 III quarter (10–12) | 481 (27.3) | 22,194 (28.6) | 22,675 (28.6) |
 IV quarter (13+) | 193 (10.9) | 15,537 (20.0) | 15,730 (19.8) |
Employment status of woman, n (%) | |||
 Not employed | 540 (30.6) | 16,673 (21.5) | 17,213 (21.7) |
 Employed | 1226 (69.4) | 60,952 (78.5) | 62,178 (78.3) |
 Salaried | 1184 (67.0) | 57,768 (74.4) | 58,952 (74.3) |
 Self-employed | 28 (1.6) | 2050 (2.6) | 2078 (2.6) |
 Self-employed and salaried | 14 (0.8) | 1134 (1.5) | 1148 (1.4) |
Employment status of spouse, n (%) | |||
 No spouse | 168 (9.5) | 3799 (4.9) | 3967 (5.0) |
 Not employed | 512 (29.0) | 15,523 (20.0) | 16,035 (20.2) |
 Employed | 1066 (61.5) | 58,303 (75.1) | 59,389 (74.8) |
 Salaried | 963 (54.5) | 51,041 (65.8) | 52,004 (65.5) |
 Self-employed | 83 (4.7) | 5070 (6.5) | 5153 (6.5) |
 Self-employed and salaried | 40 (2.3) | 2192 (2.8) | 2232 (2.8) |
Employment status of family, n (%) | |||
 Nobody employed | 261 (14.8) | 5590 (7.2) | 5851 (7.4) |
 Somebody Employed | 1505 (85.2) | 72,035 (92.8) | 73,540 (92.6) |
Annual Family Income, NIS; n (%) | |||
 I quarter (< 49,092) | 799 (45.2) | 19,391 (25.0) | 20,190 (25.4) |
 II quarter (49,092-107,052) | 510 (28.9) | 18,633 (24.0) | 19,143 (24.1) |
 III quarter (107,052-199,142) | 342 (19.4) | 20,336 (26.2) | 20,678 (26.0) |
 IV quarter (< 199,142) | 115 (6.5) | 19,265 (24.8) | 19,380 (24.4) |
Family Status at birth; n (%) | |||
 Single | 147 (8.3) | 3403 (4.4) | 3550 (4.5) |
 Married/In stable relationship | 1553 (87.9) | 72,769 (93.7) | 74,322 (93.6) |
 Divorced/Widow | 66 (3.7) | 1453 (1.9) | 1519 (1.9) |
Birth order of the first index birth in the data set; n (%) | |||
 1 | 887 (50.2) | 42,348 (54.6) | 43,235 (54.5) |
 2 | 298 (16.9) | 12,182 (15.7) | 12,480 (15.7) |
 3 | 232 (13.1) | 11,277 (14.5) | 11,509 (14.5) |
 4 | 164 (9.3) | 5417 (7.0) | 5581 (7.0) |
  > 5 | 185 (10.5) | 6401 (8.2) | 6586 (8.3) |