Table 2.

Characteristic features of body composition of girls and women (n = 50) with Rett syndrome

Variable	Number of subjects*	Value**
Bone mineral content
Total body (g)	49	850 ± 466
(z-score)	49	-2.2 ± 1.0†
(% <-1 SD)	49	84
(% <-2 SD)	49	59
Spine (g)	46	22 ± 13
Hip (g)	47	9.8 ± 5.8
Bone mineral density
Total body (g/cm2)	49	0.792 ± 0.140
(z-score)	49	-1.7 ± 1.2†
(% <-1 SD)	49	76
(% <-2 SD)	49	45
Spine (g)	46	0.597 ± 0.213
Hip (g)	47	0.471 ± 0.145
Lean body mass (kg)	46	19.6 ± 8.4
(% body weight)	46	66 ± 7
Body fat (kg) by DXA	46	10.1 ± 7.2
(% body weight)	46	31 + 7
Body fat (kg) by anthropometry‡	50	10.1 ± 6.5
(%body weight)	50	30.9 ± 4.5

^*One individual unknowingly had metal devices in spine and hip; movement artifact prevented estimates of the components of body composition in some subjects

^**Values expressed as mean ± SD where appropriate

^†P<0.05, different from the reference population (10)

^‡Determined from the sum of triceps, biceps, subscapular, and suprailiac skinfold thicknesses (13)