Table 2.

Data on the children after birth and at the first measurement point T1

	M (SD)	N*
Birth during gestational week	38.77(2.32)	148
Weight at birth (g)	3159.31 (634.08)	152
Age T1 (weeks, corrected due to prematurity)	18.73 (2.66)	152
	n (%)	N*
Gender/male	80 (52.3%)	153
Premature infant (birth < 37 SSW)	17 (11.5%)	148
Low gestational weight (< 2500 g)	23 (15.1%)	152

*The variance of the N values depends on different return rates.