Table 4

Effect modification of an association* between shift work and diabetes incidence among 19 873 Danish female nurses by BMI

 Normal and overweight (BMI ≤30 kg/m3)Obese (BMI >30 kg/m3)p Value
HR (95% CI)HR (95% CI)
Day shift1.001.00
Evening shifts1.20 (0.95 to 1.53)1.38 (0.86 to 2.22)
Night shifts1.74 (1.33 to 2.27)1.40 (0.85 to 2.32)
Rotating shifts1.05 (0.86 to 1.27)1.14 (0.78 to 1.66)
0.67
Normal weight (BMI ≤25 kg/m3)Overweight (BMI >25 kg/m3)
Day shift1.001.00
Evening shifts1.37 (1.01 to 1.86)1.18 (0.87 to 1.59)
Night shifts1.74 (1.20 to 2.51)1.54 (1.14 to 2.08)
Rotating shifts0.94 (0.71 to 1.24)1.15 (0.92 to 1.43)
0.37
  • *Adjusted for age, smoking status, smoking intensity, physical activity, alcohol consumption (g/week), intake of fatty meat, marital status, employment status, acute myocardial infarction, hypertension, fruit and vegetables intake.

  • †p Value for interaction.

  • BMI, body mass index.