Table 2: Correlation between BMI and NAFLD.

BMI (Kg/m2)BMI < 23.023.0 ≤ BMI < 25.0BMI ≥ 25.0  Total
Xk012

NAFLD group 10 (20.61)62 (16.98)178 (44.87)250
Non-NAFLD group bk149 (13.39)43 (11.02)48 (39.41)240

Total342865127

1.021.8329.92
20.5356.83
95% CI5.24~90.7914.54~222.15

refers to the theoretical frequency corresponding to ak.