Table 4 Stratified associations between WWI and NAFLD by age, sex, BMI, exercise habits, drinking status and smoking status

Age (years)

0.1455

0.7311

0.1845

 18–44

1.84 (1.47, 2.29)

2.07 (1.56, 2.73)

1.61 (1.11, 2.33)

 45–59

1.85 (1.53, 2.24)

1.89 (1.39, 2.57)

1.77 (1.39, 2.27)

  ≥ 60

1.01 (0.57, 1.79)

1.43 (0.57, 3.61)

0.83 (0.38, 1.78)

BMI (kg/m²)

0.0016

< 0.0001

0.0290

  < 25

2.59 (2.23, 3.02)

3.21 (2.56, 4.01)

2.38 (1.89, 3.00)

  ≥ 25

1.78 (1.45, 2.19)

1.53 (1.13, 2.09)

1.56 (1.15, 2.12)

Exercise habits

0.8434

0.2454

0.5225

 Yes

1.67 (1.20, 2.32)

1.44 (0.91, 2.29)

1.89 (1.13, 3.18)

 No

1.73 (1.49, 2.01)

1.94 (1.56, 2.43)

1.58 (1.28, 1.96)

Smoking status

0.5799

0.3057

0.1763

 Non

1.81 (1.52, 2.15)

2.11 (1.55, 2.87)

1.70 (1.38, 2.09)

 Former

1.51 (1.08, 2.10)

1.49 (1.05, 2.11)

1.82 (0.74, 4.49)

 Current

1.62 (1.18, 2.21)

1.91 (1.37, 2.68)

0.87 (0.45, 1.68)