Table 3 Associations between ever exposed to light at night, phase shift and sleep disruption during night shift stratified by different variables (all age group-adjusted)
From: The association between different night shiftwork factors and breast cancer: a case–control study
Stratifying variables | N a total | Graveyard OR (95% CI) | N a | Light at night OR (95% CI) | N a | Phase shift OR (95% CI) | N a | Sleep disruption OR (95% CI) | N a |
|---|---|---|---|---|---|---|---|---|---|
Circadian preference | |||||||||
Evening type | 248/357 | 0.95 (0.66–1.38) | 66/97 | 0.96 (0.65–1.42) | 57/83 | 1.02 (0.68–1.52) | 53/75 | 1.15 (0.68–1.92) | 30/39 |
Neutral type | 594/924 | 1.34 (1.04–1.73) | 136/170 | 1.25 (0.96–1.64) | 119/155 | 1.34 (1.02–1.77) | 112/139 | 1.22 (0.84–1.77) | 54/71 |
Morning type | 344/488 | 1.12 (0.81–1.55) | 86/111 | 1.20 (0.85–1.68) | 77/95 | 1.23 (0.87–1.72) | 77/93 | 1.30 (0.84–2.04) | 43/46 |
Circadian amplitude | |||||||||
Vigorous | 238/340 | 1.20 (0.79–1.82) | 52/65 | 1.06 (0.68–1.64) | 43/58 | 1.12 (0.72–1.74) | 42/56 | 1.03 (0.55–1.94) | 19/26 |
Neutral | 610/863 | 1.12 (0.88–1.43) | 155/200 | 1.21 (0.94–1.55) | 144/175 | 1.25 (0.97–1.61) | 139/165 | 1.26 (0.90–1.77) | 72/82 |
Languid | 344/569 | 1.22 (0.88–1.70) | 78/114 | 1.09 (0.76–1.55) | 63/100 | 1.17 (0.81–1.69) | 58/87 | 1.24 (0.78–1.97) | 35/49 |
Circadian stability | |||||||||
Rigid | 274/385 | 1.16 (0.77–1.77) | 47/61 | 1.10 (0.70–1.71) | 40/53 | 1.10 (0.70–1.73) | 39/52 | 1.48 (0.85–2.59) | 28/27 |
Neutral | 614/944 | 1.28 (1.00–1.65) | 138/173 | 1.25 (0.96–1.63) | 122/155 | 1.26 (0.96–1.66) | 112/143 | 1.16 (0.80–1.66) | 56/76 |
Flexible | 302/444 | 1.00 (0.73–1.37) | 101/146 | 1.05 (0.76–1.45) | 90/126 | 1.23 (0.89–1.71) | 90/113 | 1.00 (0.71–1.70) | 42/55 |
Menopausal status at time of recruitment | |||||||||
Postmenopausal | 366/419 | 1.18 (0.96–1.45) | 196/285 | 1.17 (0.94–1.45) | 170/247 | 1.21 (0.97–1.51) | 168/236 | 1.28 (0.94–1.72) | 84/112 |
Premenopausal | 836/1366 | 1.13 (0.81–1.57) | 92/96 | 1.10 (0.78–1.55) | 83/88 | 1.22 (0.85–1.74) | 74/73 | 1.08 (0.69–1.68) | 43/46 |
