Summary of all variables for each exposure category (short term exposure model)
| Variable | Category | External control (n=236) | Internal control (n=230) | <20 μg/dl (n=71) | 20–29 μg/dl (n=156) | 30–39 μg/dl (n=162) | 40+ μg/dl (n=184) | Missing (n=65) | Total (n=1104) |
|---|---|---|---|---|---|---|---|---|---|
| All values are numbers of subjects (% of lead group), unless otherwise stated. Missing values are not stated, but can readily be calculated from the totals for each exposure group. Except for genitourinary disorders and infertility treatment, they were approximately 5% of values or less. | |||||||||
| Country | Belgium | 77 (33) | 14 (7) | 17 (24) | 19 (12) | 19 (11) | 15 (8) | 9 (14) | 170 (15) |
| Finland | 71 (30) | 4 (2) | 6 (8) | 4 (3) | 5 (3) | 4 (2) | 9 (14) | 103 (9) | |
| Italy | 36 (15) | 76 (33) | 28 (39) | 89 (57) | 71 (44) | 24 (13) | 7 (11) | 331 (30) | |
| England | 52 (22) | 136 (59) | 20 (28) | 44 (28) | 67 (41) | 141 (77) | 40 (62) | 500 (45) | |
| Male age at target time | Mean (SD) | 29 (5) | 27 (5) | 31 (5) | 31 (6) | 32 (6) | 31 (6) | 32 (6) | 30 (5) |
| Male age group at target time | <30 | 121 (51) | 152 (66) | 33 (46) | 68 (44) | 62 (38) | 69 (38) | 21 (32) | 526 (48) |
| 30+ | 114 (48) | 78 (34) | 38 (54) | 88 (56) | 100 (62) | 114 (62) | 44 (68) | 576 (52) | |
| Female age at target time | Mean (SD) | 27 (4) | 25 (4) | 28 (4) | 28 (5) | 28 (5) | 28 (5) | 28 (5) | 27 (5) |
| Female age group at target time | <30 | 167 (71) | 189 (82) | 48 (68) | 102 (65) | 105 (65) | 111 (60) | 40 (62) | 762 (69) |
| 30+ | 28 (29) | 39 (17) | 22 (31) | 54 (35) | 57 (35) | 70 (38) | 22 (34) | 332 (30) | |
| First pregnancy | Yes | 81 (34) | 72 (31) | 23 (32) | 57 (37) | 33 (20) | 22 (12) | 19 (29) | 307 (28) |
| No | 155 (66) | 158 (69) | 48 (68) | 99 (63) | 129 (80) | 159 (86) | 46 (71) | 794 (72) | |
| Male smoking | Yes | 106 (45) | 120 (52) | 19 (27) | 68 (44) | 89 (55) | 100 (54) | 23 (35) | 525 (48) |
| No | 129 (55) | 109 (47) | 51 (72) | 88 (56) | 73 (45) | 83 (45) | 42 (65) | 575 (52) | |
| Female smoking | Yes | 60 (25) | 76 (33) | 15 (21) | 35 (22) | 44 (27) | 49 (27) | 24 (37) | 303 (27) |
| No | 161 (68) | 151 (66) | 55 (77) | 120 (77) | 117 (72) | 133 (72) | 41 (63) | 778 (70) | |
| Use of oral contraceptive | Yes | 100 (42) | 107 (47) | 34 (48) | 57 (37) | 62 (38) | 92 (50) | 28 (43) | 480 (43) |
| No | 119 (50) | 123 (53) | 37 (52) | 98 (63) | 99 (61) | 91 (49) | 37 (57) | 604 (55) | |
| Genitourinary disorders | Yes | 2 (1) | 4 (2) | 1 (1) | 3 (2) | 4 (2) | 0 (0) | 2 (3) | 16 (1) |
| Infertility treatment | Yes | 13 (6) | 2 (1) | 3 (4) | 3 (2) | 7 (4) | 6 (3) | 1 (2) | 35 (3) |
| Year of occurrence of target date | 76–80 | 36 (15) | 48 (21) | 2 (3) | 25 (16) | 29 (18) | 44 (24) | 33 (51) | 217 (20) |
| 81–85 | 42 (18) | 56 (24) | 5 (7) | 29 (19) | 33 (20) | 48 (26) | 6 (9) | 219 (20) | |
| 86–90 | 55 (23) | 77 (33) | 18 (25) | 38 (24) | 38 (23) | 43 (23) | 12 (18) | 281 (25) | |
| 91+ | 103 (44) | 49 (21) | 46 (65) | 64 (41) | 62 (38) | 49 (27) | 14 (22) | 387 (35) | |