Table 1. Characteristics of women in discovery and validation sets.

Characteristic	Discovery Set (3 women)	Validation Set (19 women)	p value
Age (years)	23.33±3.18	27.26±.090	0.34
Weight (kg)	59.67±1.60	72.50±4.14	0.01
Height (cm)	153.80±2.43	161.32±1.75	0.06
BMI (kg/m2)	25.22±0.13	27.74±1.39	0.09
Weeks postpartum	7.67±0.88	9.42±0.35	0.17

The discovery set was comprised of three women (1 Caucasian, 1 Hispanic/Mexican American, and 1 African American), rhGH synchronized at two time points, while the validation set arose from 19 lactating women (7 Caucasian, 8 Hispanic/Mexican American, and 4 African American). There were no statistically significant differences between the sets with respect to maternal age, height, BMI, or weeks postpartum. Weight was increased in the validation set by virtue of cohort design (p<0.01). However, this did not significantly confound composite BMI between the discovery and validation sets.