Table 2. Parental occupational exposure to ELF by case or control status.
|
Mothers
|
Fathers
|
|||||
|---|---|---|---|---|---|---|
| Exposure time period | Case, N (%) | Controls, N (%) | P-value | Case, N (%) | Controls, N (%) | P-value |
| Exposure anytime before birth | ||||||
| No/low | 123 (32) | 257 (30) | 0.408 | 67 (20) | 127 (17) | 0.176 |
| Moderate/substantial | 256 (68) | 597 (70) | 261 (80) | 621 (83) | ||
| Exposure in job up to 2 years before birth | ||||||
| No | 119 (32) | 298 (35) | 0.231 | |||
| Yes | 260 (69) | 556 (65) | ||||
| Exposure in job up to 1 year before birth | ||||||
| No | 138 (36) | 333 (39) | 0.389 | 36 (11) | 105 (14) | 0.171 |
| Yes | 241 (64) | 521 (61) | 292 (90) | 643 (86) | ||
| Exposure up to 1 year after birth | ||||||
| No | 151 (65) | 370 (69) | 0.052 | |||
| Low | 70 (30) | 126 (23) | ||||
| Moderate/substantial | 10 (4) | 41 (8) | ||||
Abbreviation: ELF=extremely low frequency.