Table 3 Univariate and multivariate regression analysis for predicting total fat mass (TFM) and percent body fat (%FAT) on BMI z-score in an overweight and obese pediatric population (4–18 years), stratified by sex and age groups

4-9^a

Male

1.9

−0.8–4.6

0.161

0.03^c

3.7

1.9–5.4

<0.001

0.22^d

Female

6.9

3.6–10.3

<0.001

0.26^d

7.0

5.2–8.8

<0.001

0.38^d

9–11^a

Male

18.1

15.3–20.9

<0.001

0.63^e

7.0

5.2–8.8

<0.001

0.38^d

Female

17.1

14.2–20.0

<0.001

0.57^e

6.7

4.4–9.1

<0.001

0.42^d

12–14^a

Male

27.0

23.2–30.9

<0.001

0.69^e

7.3

4.4–10.2

<0.001

0.22^d

Female

25.7

22.2–29.2

<0.001

0.67^e

6.1

4.4–8.0

<0.001

0.29^d

15–18^a

Male

26.4

22.5–30.3

<0.001

0.73^e

7.2

4.2–10.1

<0.001

0.26^d

Female

30.4

26.2–34.6

<0.001

0.73^e

6.0

4.0–7.9

<0.001

0.26^d

Overall^b

Male

15.1

13.3–17.0

<0.001

0.66^e

4.4

3.3–5.5

<0.001

0.29^d

Female

21.9

20.3–23.6

<0.001

0.82^e

6.8

5.8–7.8

<0.001

0.37^d