Table 1.

IGF-I sample size per postmenstrual age

Postmenstrual age (weeks)	24	25	26	27	28	29	30	31	32	33	34	35	36	TEA
Postnatal samples, n	0	0	1	3	6	12	16	22	25	33	25	26	29	40
Number of infants born at respective gestational ages	2	3	6	14	15	21	14	12	0	0	0	0	0	0
Total number of participants	2	5	10	24	39	60	74	86	81	81	81	81	81	65

Postnatal samples numbers reflect the number of samples excluding umbilical cord blood. Mean (SD) postmenstrual age at the term equivalent visit was 43.3 (2.6) weeks.

Abbreviations: TEA, term equivalent age.