Additional file 4 of The association between physical activity and body fat percentage with adjustment for body mass index among middle-aged adults: China health and nutrition survey in 2015

Additional file 4. The sex-BMI-stratified coefficients of PA on BF% among middle-aged Chinese adults in 2015. The coefficients were based on the quantile regression at 10th, 25th, 50th, 75th, and 90th percentiles. * p < 0.05. Model 1 was controlled for the total PA only. The individual-level variables were then added to the equation to estimate Model 2, including the sedentary activity time, age, educational level, marital status, household income level, energy intake, energy percentage from fat, BMI, smoking status, alcohol consumption status and region. For Model 3, urbanization index level was add to Model 2. Additional file 4 is a supplement file providing p values for Table 3.