Table 3

Comparison of outcome measures between 1st and 2nd born twin siblings

Outcome measure		Number of twin pairs		2nd born twin				1st born twin		p Value^3-150
Outcome measure		Number of twin pairs		Mean	SD			Mean	SD	p Value^3-150
Birth weight (g)	300	1214	372.4		1222	355.1	0.6
Number of infection episodes	298	0.3	0.7		0.3	0.7	0.6
Admission temperature (°F)	245	36	2.5		36	1.0	0.4

		Median	Interquartile range		Median	Interquartile range	p Value^3-151
Apgar score at 1 minute	293	6	4 to 7		6	4 to 8	<0.001
Apgar score at 5 minutes	294	8	7 to 9		8	7 to 9	0.2
CRIB score	184	3	1 to 6		2	1 to 6.5	0.06
Worst base excess in first 12 hours	194	−5	−1 to −8		−4	−1 to −7	0.2