Fig. 2

Nonlinear association between CMI and BMF derived from smooth curve fitting

Note: Smooth curve fitting demonstrates the relationship between CMI and BMF. In the resulting graph, the y-axis represents BMF, and the x-axis represents CMI. The solid red line is the smoothing curve that models the link between CMI and BMF. The blue dotted lines represent the 95% confidence interval obtained from the fit; Model adjusted for age, sex, race, education level, poverty income ratio, smoking, drinking, moderate activity, body mass index, diabetes, gastrointestinal diseases, hypertension, depression, sleep disorders, and dietary factors such as energy, total fat, moisture, dietary fiber, protein, carbohydrate, and caffeine; CM: Cardiometabolic index; BMF: Bowel movement frequency