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Chronotype in relation to shift work: A cohort study among 37,731 female nurses
Sleep Timing Patterns and Shift Work in 37,731 Female Nurses
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Abstract
The study included 37,731 Dutch female nurses who reported on their sleep patterns and shift preferences over time.
- Later are associated with a 55-minute later midsleep time compared to intermediate types.
- Preferences for night and evening shifts increase with later chronotype, with odds ratios of 2.68 and 2.20, respectively.
- Preferences for day and morning shifts decrease with later chronotype, with odds ratios of 0.17 and 0.22, respectively.
- Intermediate chronotype is linked to fewer sleep problems, with a median score of 27.2 on the sleep problem index, compared to 28.9 for morning types and 31.7 for evening types.
- Chronotype may influence sleep-wake times, shift type preference, and sleep issues among nurses.
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Key numbers
55 min
Increase in Midsleep Time
Comparison of definite evening vs. intermediate types
2.20
Odds Ratio for Evening Shift Preference
Odds ratio comparing preference for evening shifts
27.2
Median Score
Median score for sleep problems in intermediate