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Table 2 Demographic, occupational, health, and work-related psychosocial characteristics of study participants and bivariate associations between these factors and years worked at night shift among men ( n  = 272)

From: Years worked at night and body mass index among registered nurses from eighteen public hospitals in Rio de Janeiro, Brazil

  All ( n  = 272) Years worked at night p -value
<1 ( n  = 33) 1 to 9 ( n  = 106) ≥10 ( n  = 133)
Age, mean (SD) 41.3 (10.2) 36.2 (10.1) 35.1 (7.9) 47.5 (8.0) <0.001
Per capita income (USD)a, mean (SD) 1,073.7 (743.6) 909.7 (611.2) 1,105.1 (762.2) 1,132.3 (755.4) 0.283
Weekly work hours, mean (SD) 59.3 (18.7) 54.2 (20.2) 58.7 (18.7) 61.0 (18.3) 0.166
Years of work in nursing, mean (SD) 14.3 (9.5) 14.2 (9.7) 13.7 (9.1) 14.7 (9.7) 0.744
BMI at 20 years, mean (SD) 22.4 (3.0) 22.7 (2.7) 22.8 (3.1) 22.1 (3.1) 0.217
BMI (current), mean (SD) 27.3 (4.1) 26.4 (3.4) 27.0 (3.9) 27.9 (4.3) 0.099
Marital status (% married) 69.1 54.5 62.3 78.2 0.005
Smoking status      
 Never smoker 72.8 78.8 74.5 69.9 0.596
 Ex-smoker 18.8 18.2 18.9 18.8
 Current smoker 8.4 3.0 6.6 11.3
Alcohol consumption      
 Abstained 26.8 30.3 27.4 25.6 0.145
 Low 18.0 12.1 14.2 22.6
 Medium 40.1 54.5 39.5 36.8
 High 15.1 3.1 18.9 15.0
Physical activity (% yes) 41.2 45.5 43.4 38.3 0.636
Usual sleep duration, mean (SD) 6.9 (1.6) 6.8 (1.5) 7.0 (1.7) 6.9 (1.6) 0.709
  1. aPrice on 12/30/2012 (BRL2.02).