Table 3.

Median age at peak growth velocity and Super-Imposition by Translation and Rotation (SITAR) model summaries, including number of individuals (n) and parameter sd for height, weight, BMI, grip strength fitted on age by gender, in the sample of children and adolescents (n 40 484) aged 3–19 years of Ladino and Maya ancestry born during 1955–1993 in Guatemala (n _observations 157 067)

Variable	SITAR model summary	Males	Females
Height (cm)	n	22 746	17 738
	Median age at peak velocity (years)	13·3	11·4
	Spline degrees of freedom	6	6
	sd of size random effect (cm)	8·0	7·1
	sd of timing random effect (%)	7·9	8·5
	sd of intensity random effect (%)	12·1	12·4
	Timing–intensity correlation	0·37	0·17
	Size–timing correlation	0·33	0·22
	Size–intensity correlation	0·64	0·48
	Variance explained (%)	97·8	98·2
Weight (kg)	n	22 734	17 720
	Median age at peak velocity (years)	13·2	11·8
	Spline degrees of freedom	5	5
	sd of size random effect (%)	15·1	14·2
	sd of timing random effect (years)	1·0	1·0
	sd of intensity random effect (%)	15·2	16·4
	Timing-intensity correlation	−0·45	−0·21
	Size–timing correlation	−0·07	−0·02
	Size–intensity correlation	0·33	0·23
	Variance explained (%)	93·7	94·3
BMI (kg/m2)	n	22 734	17 720
	Median age at peak velocity (years)	14·6	12·2
	Spline degrees of freedom	4	4
	sd of size random effect (%)	12·0	12·0
	sd of intensity random effect (%)	33·2	36·2
	Size–intensity correlation	0·45	0·33
	Variance explained (%)	84·7	84·9
Grip strength (kg-force)	n	22 716	17 695
	Median age at peak velocity (years)	14·4	11·8
	Spline degrees of freedom	5	4
	sd of size random effect (kg-force)	3·4	3·1
	sd of intensity random effect (%)	23·9	24·8
	Size–intensity correlation	0·81	0·81
	Variance explained (%)	77·7	69·0