Table III.

Association of socioeconomic indicators with child trunk length measured at age 6.5 years in Belarus (2002–2005), n = 11 074

	Difference in child trunk length (95% confidence interval) (cm)
	Model 1	r 2	Model 2	Model 3	Model 4	Model 5	p for sex interaction
Mother’s education
Initial/incomplete/common secondary	0		0	0	0	0
Advanced secondary/partial university	0.54		0.57	0.44	0.44	0.29
	(0.37,0.71)		(0.42,0.72)	(0.29,0.60)	(0.28,0.60)	(0.15,0.43)
Completed university	0.95		0.97	0.72	0.71	0.42
	(0.71,1.19)		(0.74,1.19)	(0.45,0.98)	(0.45,0.98)	(0.20,0.64)
p-value for trend	< 0.01	0.018	< 0.01	< 0.01	< 0.01	< 0.01	0.57
Father’s education
Initial/incomplete/common secondary	0		0	0	0	0
Advanced secondary/partial university	0.30		0.34	0.26	0.25	0.16
	(0.08,0.53)		(0.14,0.54)	(0.07,0.44)	(0.07,0.44)	(− 0.02,0.34)
Completed university	0.63		0.65	0.45	0.45	0.18
	(0.41,0.86)		(0.44,0.87)	(0.23,0.67)	(0.23,0.67)	(− 0.01,0.38)
p-value for trend	< 0.01	0.011	< 0.01	< 0.01	< 0.01	0.05	0.55
Highest household occupation
Manual worker	0		0	0	0	0
Non-manual worker	0.53		0.54	0.36	0.36	0.16
	(0.35,0.70)		(0.39,0.70)	(0.21,0.51)	(0.21,0.51)	(0.01,0.31)
p-value for trend	< 0.01	0.014	< 0.01	< 0.01	< 0.01	0.04	0.32

Model 1: adjusted for urban or rural residence and East or West of Belarus.

Model 2: as Model 1 and additionally adjusted for study trial arm for breastfeeding promotion.

Model 3: as Model 2 and additionally adjusted for: parent’s age, smoking and alcohol intake, number of older and younger siblings.

Model 4: as Model 3 and additionally adjusted for: hospitalizations in infancy or childhood for any reason.

Model 5: as Model 4 and additionally adjusted for: mid-parental height.

Robust standard errors were used to compute confidence intervals and p-values to account for clustering by polyclinic.