Characteristic | Exposure category | ||||
---|---|---|---|---|---|
No chlorination low colour n (%) | No chlorination high colour n (%) | Chlorination low colour n (%) | Chlorination high colour n (%) | Total n (%) | |
Total | 19480 (100) | 11836 (100) | 34063 (100) | 71766 (100) | 137145 (100) |
Maternal age: | |||||
<20 | 575 (3.0) | 415 (3.5) | 774 (2.3) | 1470 (2.0) | 3234 (2.4) |
20–34 | 16371 (84.0) | 9989 (84.4) | 28731 (84.3) | 60486 (84.3) | 115577 (84.3) |
⩾35 | 2534 (13.0) | 1432 (12.1) | 4558 (13.4) | 9810 (13.7) | 18334 (13.4) |
Parity:1-150 | |||||
0 | 7232 (37.5) | 4164 (35.6) | 13571 (40.1) | 31033 (43.5) | 56000 (41.1) |
1 | 6746 (35.0) | 4076 (34.8) | 12655 (37.4) | 25456 (35.7) | 48933 (35.9) |
2 | 3662 (19.0) | 2467 (21.1) | 5682 (16.8) | 10846 (15.2) | 22657 (16.6) |
3– | 1630 (8.5) | 995 (8.5) | 1921 (5.7) | 4029 (5.6) | 8575 (6.3) |
Born in university clinic: | |||||
No | 19317 (99.2) | 11146 (94.2) | 32143 (94.4) | 51711 (72.1) | 114317 (83.4) |
Yes | 163 (0.8) | 690 (5.8) | 1920 (5.6) | 20055 (27.9) | 22828 (16.6) |
Centrality: | |||||
Low | 14734 (75.6) | 7547 (63.8) | 11386 (33.4) | 11732 (16.3) | 45399 (33.1) |
Medium | 3922 (20.1) | 958 (8.1) | 10240 (30.1) | 17497 (24.4) | 32617 (23.8) |
High | 824 (4.2) | 3331 (28.2) | 12437 (36.5) | 42537 (59.3) | 59129 (43.1) |
Population density (urban/total population(%)): | |||||
<20 | 2557 (13.1) | 2193 (18.5) | 682 (2.0) | 1702 (2.4) | 7134 (5.2) |
20–39.9 | 3783 (19.4) | 3249 (27.5) | 1778 (5.2) | 3911 (5.4) | 12721 (9.3) |
40–59.9 | 5456 (28.0) | 2994 (25.3) | 5923 (17.4) | 5481 (7.6) | 19854 (14.5) |
60–79.9 | 6081 (31.2) | 2359 (19.9) | 7050 (20.7) | 13869 (19.3) | 29359 (21.4) |
80– | 1603 (8.2) | 1041 (8.8) | 18630 (54.7) | 46803 (65.2) | 68077 (49.6) |
Industrial profile: | |||||
Low | 494 (2.5) | 610 (5.2) | 108 (0.3) | 421 (0.6) | 1633 (1.2) |
Medium | 2025 (10.4) | 985 (8.3) | 2061 (6.1) | 768 (1.1) | 5839 (4.3) |
High | 16961 (87.1) | 10241 (86.5) | 31894 (93.6) | 70577 (98.3) | 129673 (94.6) |
↵1-150 Missing information 980.