Table 4. Relationship of infant independent variable to Z-score transformed plasma cortisol and CSF CRF change (Δ = Post—Pre) to VFD exposure infant variables.

Infant Variables	z-score of Δ cortisol	z-score of Δ CRF
Infant age at VFD onset* (days)	0.39, p = 0.076	0.19, p = 0.39
Infant weight at VFD onset (kg)	0.49, p = 0.020A	-0.06, p = 0.76A
Infant sex (M = 1)	-0.18, p = 0.41	0.43, p = 0.043

^A: Repeated Measures x Infant Weight (kg): F_(1,20) = 4.35; p = 0.05 (low infant weight = ↓cort)

*data on one subject not available, VFD = variable foraging demand, CSF = cerebrospinal fluid, CRF = corticotropin releasing-factor