Table 3.

Mixed-effects regression model predicting the association between chronic NISS and salivary cortisol concentrations (log nmol/L).

Variables		β	95% CI	P-value
Chronic NISS		0.01	−0.02, 0.04	0.61
Female Sex		−0.001	−0.23, 0.23	0.99
Postmenstrual Age		−0.11	−0.16, −0.07	<0.001*
Birth weight z-score		−0.02	−0.15, 0.11	0.76
Gestational Age		0.05	−0.03, 0.14	0.26
Race/ ethnicity
	Non-Hispanic White	Ref.	Ref.	Ref.
	Non-Hispanic Black	0.10	−0.20, 0.40	0.58
	Hispanic	0.02	−0.35, 0.41	0.92
	Other	−0.01	−0.26, 0.28	0.95
Cesarean birth		0.01	−0.25, 0.26	0.96
Private Insurance		0.21	−0.01, 0.44	0.07
Base excess		0.01	−0.02, 0.04	0.34
NICU morbidity		0.11	−0.16, 0.39	0.40
Caffeine Treatment		0.32	0.05, 0.60	0.02*