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Table 1 Demographic characteristics of nurses with different kinds of night work load

From: Associations between night work and BMI, alcohol, smoking, caffeine and exercise - a cross-sectional study

  Number of nights worked last year
0 (n = 568) 1-30 (n = 860) >30 (n = 631)
Age (n = 2057) 34.9 (34.2-35.6) 32.4 (31.8-32.9) 32.4 (31.8-33.0)
Gender (% female) (n = 2049) 92.6 % (90.4-94.7) 92.5 % (90.7-94.3) 86.3 % (83.6-89.0)
Hours Worked Per Week (n = 2017) 34.0 (33.4-34.6) 33.7 (33.2-34.1) 34.2 (33.6-34.7)
Average hours Sleep per Night (n = 2048) 6.9 (6.8-7.0) 6.9 (6.8-7.0) 7.0 (6.9-7.0)
Worked Schedule including Night Work (% > 5 years) (n = 1750) 26.7 % (21.8-31.5) 29.5 % (26.4-32.7) 43.5 % (39.6-47.5)
Sweaty Excercise (% > 1 hour per week) (n = 1971) 64.1 %(60.0-68.1) 67.4 % (64.2-70.1) 65.7 % (61.2-69.5)
BMI (n = 2038) 24.4 (24.0-24.7) 24.1 (23.9-24.4) 24.8 (24.4-25.1)
Obesity (n = 2038) 10.0 % (7.6-12.6) 6.6 % (4.9-8.3) 11.7 % (9.2-14.3)
AUDIT-C (n = 2021) 3.3 (3.2-3.5) 3.7 (3.6-3.8) 3.8 (3.7-4.0)
Caffeine Containing Drinks per Day (n = 2050) 3.2 (3.0-3.5) 2.8 (2.7-3.0) 3.2 (3.0-3.4)
Daily Smokers (n = 1956) 12.9 % (10.1-15.7) 9.7 % (7.7-11.7) 10.7 % (8.8-13.2)
Cigarettes per day among daily smokers (n = 214) 10.0 (8.6-11.4) 9.0 (7.9-10.1) 9.1 (7.9-10.3)
  1. Confidence Intervals 95 % in parenthesis. BMI body mass index. Obesity defined as BMI >30. AUDIT-C = The AUDIT alcohol consumption questions