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

Table 3

Discriminative ability to predict perinatal death or adverse outcome of birth weight ratio and birth weight percentile.

	Area under the curve		value
	Birth weight ratio	Birth weight percentile
25–28 weeks
Perinatal death	0.73	0.73	0.78
Composite adverse outcome	0.65	0.65	1.00
29–32 weeks
Perinatal death	0.65	0.65	0.88
Composite adverse outcome	0.56	0.56	0.82
33–36 weeks
Perinatal death	0.70	0.69	0.69
Composite adverse outcome	0.56	0.56	1.00
37–42 weeks
Perinatal death	0.64	0.64	0.77
Composite adverse outcome	0.55	0.55	0.22