Table 2

Correlation coefficients for weights, weight gains, and BMI z scores at age 7

	Birth weight(z score)	6 week weight(z score)	18 month weight (z score)	BMI at age 7(z score)	Birth to 6 weeks weight change(z score)	6 weeks to 18 months weight change(z score)	Birth to 18 months weight change(z score)
p values for all coefficients presented are less than 0.001.
Birth weight (z score)	1.00
6 week weight (z score)	0.54	1.00
18 month weight (z score)	0.32	0.47	1.00
BMI at age 7 (z score)	0.15	0.23	0.40	1.00
Birth to 6 weeks weight	−0.31	0.63	0.24	0.12	1.00
change (z score)
6 weeks to 18 months weight	−0.15	−0.41	0.61	0.21	−0.32	1.00
change (z score)
Birth to 18 months weight	−0.37	0.09	0.76	0.29	0.45	0.70	1.00
change (z score)