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Table 1 Seasonal differences in sleep

From: Is there a negative impact of winter on mental distress and sleeping problems in the subarctic: The Tromsø Study

  Season for attending the study  
Polar night Spring Polar Day Autumn p3
Mean sleep duration 7.12 (0.96)1 7.17 (1.00)1 7.15 (1.01)1 7.14 (1.01)1 0.20
Usually suffering from sleeplessness during Polar night 420 (14.0)2 261 (14.3)2 136 (10.1)2 271 (9.8) 2 0.008
Current sleeping problems 278 (9.4)2 79 (4.4)2 74 (5.6)2 134 (4.9)2 <0.001
-rather more than usual 223 (7.5) 69 (3.8) 62 (4.7) 116 (4.3) <0.001
-much more than usual 55 (1.9) 10 (0.6) 12 (0.9) 18 (0.7) <0.001
  1. 1Mean sleep duration in hours (SD).
  2. 2Number (%).
  3. 3Kruskal-Wallis test