Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study

Table 4

Discriminative ability of birth weight ratio and birth weight percentile in case of birth weight below the 10th percentile for gestational age.

	Area under the curve		value
	Birth weight ratio	Birth weight percentile
25–28 weeks
Perinatal death	0.70	0.76	0.09
Composite adverse outcome	0.61	0.63	0.75
29–32 weeks
Perinatal death	0.69	0.68	0.67
Composite adverse outcome	0.61	0.58	0.43
33–36 weeks
Perinatal death	0.68	0.63	0.01
Composite adverse outcome	0.67	0.60	<0.001
37–42 weeks
Perinatal death	0.69	0.67	0.05
Composite adverse outcome	0.65	0.64	0.15