Table 2. Skeletal muscle to body fat ratio (MFR) by sex, age and body mass index (BMI).

Age	MFR for normal BMI (BMI < 85th percentile for age and sex)	MFR for overweight and obesity (BMI ≥ 85th percentile for age and sex)	P value
Boys
10 yr	1.36 ± 0.44	0.68 ± 0.13	< 0.001
11 yr	1.30 ± 0.51	0.71 ± 0.16	< 0.001
12 yr	1.57 ± 0.67	0.77 ± 0.18	< 0.001
13 yr	1.80 ± 0.68	0.92 ± 0.18	< 0.001
14 yr	2.08 ± 0.92	1.05 ± 0.38	< 0.001
15 yr	2.27 ± 0.77	0.99 ± 0.18	< 0.001
16 yr	2.21 ± 0.77	1.03 ± 0.21	< 0.001
17 yr	2.02 ± 0.73	1.19 ± 0.34	< 0.001
18 yr	1.99 ± 0.69	1.19 ± 0.28	< 0.001
total	1.88 ± 0.78	0.94 ± 0.30	< 0.001
Girls
10 yr	1.02 ± 0.27	0.70 ± 0.10	< 0.001
11 yr	1.09 ± 0.31	0.71 ± 0.12	< 0.001
12 yr	1.13 ± 0.34	0.79 ± 0.14	< 0.001
13 yr	1.04 ± 0.30	0.69 ± 0.14	< 0.001
14 yr	0.90 ± 0.20	0.68 ± 0.16	< 0.001
15 yr	0.89 ± 0.19	0.66 ± 0.14	< 0.001
16 yr	0.88 ± 0.17	0.65 ± 0.13	< 0.001
17 yr	0.85 ± 0.17	0.64 ± 0.17	< 0.001
18 yr	0.92 ± 0.20	0.54 ± 0.12	< 0.001
total	0.96 ± 0.26	0.68 ± 0.15	< 0.001

Note- Data are means ± standard deviations.