Table 2.
Baseline risk factors for incident NAFLD according to BMI categories.
| BMI < 18.5 | 18.5 ≤ BMI < 23.0 | 23.0 ≤ BMI < 25.0 | BMI ≥ 25.0 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| aHR | 95% CI | P | aHR | 95% CI | P | aHR | 95% CI | P | aHR | 95% CI | P | |
| Model 1 | ||||||||||||
| Lowest SMI_Wt tertile | NA | 2.90 | 2.35–3.57 | < 0.001 | 1.35 | 0.98–1.87 | 0.070 | 1.66 | 0.95–2.88 | 0.073 | ||
| Middle SMI_Wt tertile | 1.77 | 0.39–8.00 | 0.456 | 1.80 | 1.55–2.09 | < 0.001 | 1.09 | 0.79–1.51 | 0.604 | 1.46 | 0.82–2.61 | 0.198 |
| Fat percentage | 1.07 | 0.96–1.18 | 0.223 | 1.16 | 1.13–1.18 | < 0.001 | 1.07 | 1.03–1.11 | < 0.001 | 1.05 | 1.02–1.07 | < 0.001 |
| Model 2 | ||||||||||||
| Lowest SMI_Wt tertile | NA | 2.20 | 1.77–2.73 | < 0.001 | 1.22 | 0.88–1.70 | 0.235 | 1.46 | 0.84–2.54 | 0.185 | ||
| Middle SMI_Wt tertile | 2.11 | 0.45–9.99 | 0.345 | 1.54 | 1.33–1.79 | < 0.001 | 1.01 | 0.73–1.40 | 0.972 | 1.40 | 0.78–2.50 | 0.260 |
| Fat percentage | 1.07 | 0.96–1.19 | 0.201 | 1.12 | 1.09–1.15 | < 0.001 | 1.05 | 1.02–1.09 | 0.001 | 1.03 | 1.00–1.05 | 0.038 |
Model 1: adjusted for age, sex and smoking; Model 2: Model 1 and further adjusted for blood pressure, glucose, triglyceride, HDL and uric acid.
BMI body mass index, aHR adjusted hazard ratio, CI confidence interval, SMI_Wt weight-adjusted skeletal muscle index, HDL high- density lipoprotein.