Table 3.

Weight change from Day 0 to Day 30.

	Raw weight change [mean (SD)]			Percent weight change [mean (SD)]
	Primary cohort < 2000 g (N = 104)	Secondary cohort > 2000 g (N = 405)	Primary vs secondary p-value	Primary cohort < 2000 g (N = 104)	Secondary cohort > 2000 g (N = 405)	Primary vs secondary p-value
Mean change in weight from birth to…
Day 1	− 60 (34)	− 131 (75)	< 0.001	− 3.42 (1.95)	− 4.18 (2.32)	0.002
Day 2	− 108 (57)	− 157.97 (114.12)	< 0.001	− 6.17 (3.13)	− 5.02 (3.52)	0.003
Day 3	− 116 (80)	− 99 (135)	0.107	− 6.65 (4.52)	− 3.16 (4.29)	< 0.001
Day 4	− 100 (98)	− 44 (140)	< 0.001	− 5.73 (5.55)	− 1.37 (4.42)	< 0.001
Day 5	− 81 (110)	+ 11 (156)	< 0.001	− 4.70 (6.27)	+ 0.42 (5.03)	< 0.001
Day 12	+ 39 (166)	+ 303 (231)	< 0.001	+ 2.04 (9.24)	+ 9.79 (7.52)	< 0.001
Day 30	+ 570 (375)	+ 1000 (342)	< 0.001	+ 31.98 (20.35)	+ 32.92 (12.20)	0.660
Weight nadir	− 144 (77)	− 190 (119)	< 0.001	− 8.25 (4.40)	− 6.06 (3.65)	< 0.001
Day of weight nadir* [mean (SD)]	3.57 (3.45)	2.09 (2.12)	< 0.001	–	–	–

SD, standard deviation; g, gram(s); N, number.

* Median (interquartile range): small infants 3 (2–4); larger infants 2 (1–2).

Bolded p-values are statistically significant.