Table 2.

Correlation between BMI and NAFLD.

BMI (Kg/m2)	BMI < 23.0	23.0 ≤ BMI < 25.0	BMI ≥ 25.0	Total
Xk	0	1	2
NAFLD group ak(*Tk)	10 (20.61)	62 (16.98)	178 (44.87)	250
Non-NAFLD group bk	149 (13.39)	43 (11.02)	48 (39.41)	240
Total	34	28	65	127
$\text{O}\widehat{\text{R}}$	1.0	21.83	29.92
χ MH 2	—	20.53	56.83
95% CI	—	5.24~90.79	14.54~222.15

*T_k refers to the theoretical frequency corresponding to a_k.