Basal salivary cortisol levels (mean, se) by gestational age at birth ELGA (23-28 weeks), VLGA (29-32 weeks), Full-term (38-41 weeks) at 3, 6, 8, 18 months corrected age (analyzed crossectionally)
3 months N=166: 34 ELGA, 59 VLGA, 73 full-term
6 months N=160: 29 ELGA, 65 VLGA, 66 full-term
8 months N=139: 40 ELGA, 48 VLGA, 51 full-term
18 months N=121: 43 ELGA, 38 VLGA, 40 full-term
(55 [24%]) were seen at only one age, 53 [24%] at two ages, 65 [29%] at three ages, and 52 [23%] seen at all four ages)