Table 4.
Associations between female infertility categories and night shift work among women who required fertility treatment to conceive a first birth.
| Prevalence of infertility diagnoses n (%) | Night shift workers vs all other women | Night shift workers vs day workers | |||||
|---|---|---|---|---|---|---|---|
| Infertility category | Night shift workers (n = 243) | All other women (n = 1,815) | Non-shift employed workers (n = 1,514) | Unadjusted OR [95%CI] | Adjusteda OR [95%CI] | Unadjusted OR [95%CI] | Adjusteda OR [95%CI] |
| Ovulatory dysfunction | 48 (19.8) | 379 (20.9) | 318 (21.0) | 0.93 [0.67–1.30] | 0.93 [0.66–1.31] | 0.93 [0.66–1.30] | 0.90 [0.64–1.27] |
| Endometriosis | 76 (31.3) | 451 (24.8) | 390 (25.8) | 1.37 [1.03–1.84] | 1.39 [1.04–1.87] | 1.31 [0.98–1.76] | 1.34 [1.00–1.80] |
| Tubal blockage/problem | 77 (31.7) | 648 (35.7) | 520 (34.3) | 0.84 [0.63–1.11] | 0.82 [0.62–1.10] | 0.89 [0.66–1.19] | 0.88 [0.65–1.18] |
| Menstrual irregularity | 76 (31.3) | 451 (24.8) | 366 (24.2) | 1.38 [1.03–1.84] | 1.38 [1.03–1.85] | 1.42 [1.06–1.91] | 1.42 [1.05–1.91] |
| Unexplained infertility | 31 (12.8) | 307 (16.9) | 269 (17.8) | 0.72 [0.48–1.07] | 0.73 [0.49–1.08] | 0.68 [0.45–1.01] | 0.69 [0.46–1.03] |
CI, confidence interval; OR, odds ratio.
a
Analyses adjusted for ethnicity and socio-economic indexes for areas.