Table 2.
Linear effect of night shift work on sleep duration (minutes:seconds)
| 1 | 2 | 3 | 4 | |||||
|---|---|---|---|---|---|---|---|---|
| No covariates | Demographics, employment, eveningness PGS and 5 PCs (Principle Components) adjusted for | Alcohol, smoking, and snoring adjusted for | Commuting and neuroticism adjusted for | |||||
| Variable | B | % Change | B | % Change | B | % Change | B | % Change |
| Regularity of night work (never/rarely ref.) | ||||||||
| Sometimes works nights | −7:22*** [−9:55, −4:49] |
−1.97% | −4:46*** [−7:17, −2:14] |
−1.26% | −4:43*** [−7:15, −2:11] |
−1.25% | −4:25*** [−7:24, −1:26] |
−1.18% |
| Usually works nights | −3:43 [−8:32, 1:06] |
−1.23% | −1:47 [−6:34, 2:59] |
−0.65% | −1:41 [−6:28, 3:05] |
−0.62% | −1:38 [−6:51, 3:34] |
−0.62% |
| Always works nights | −15:23*** [−19:08, −11:37] |
−4.25% | −12:43*** [−16:28, −8:58] |
−3.46% | −12:37*** [−16:22, −8:53] |
−3.43% | −12:49*** [−17:01, −8:36] |
−3.47% |
| N | 53 211 | 53 211 | 53 211 | 53 211 | ||||
| R 2 | 0.003 | 0.027 | 0.028 | 0.036 | ||||
Beta coefficient (B) shows change in self-reported sleep duration (minutes:seconds). Confidence intervals, shown in parentheses, are calculated using bootstrapped standard errors (based on 1000 replications) that are clustered around the family ID. The “% Change” column shows change in the percentage of total sleep duration; this is the B coefficient on the natural log of sleep duration. All estimates are produced from a one-third random sample of the UK Biobank, which includes individuals between the ages of 39 and 65 who are in paid employment of at least 10 h per week. Nested models are shown which sequentially add covariates from variables from left to right. ***p < 0.00.