Measuring newborn foot length to identify small babies in need of extra care: a cross sectional hospital based study with community follow-up in Tanzania

Table 2 Sensitivity, specificity, positive and negative predictive values of short foot length to identify small baby outcomes¹in southern Tanzania

First Day of life		Sensitivity (95%CI)	Specificity (95% CI)	Positive predictive value %	Negative predictive value %
Foot length	Outcome
<7 cm	very LBW (<1500 g)	75% (36-100)	99% (97-99)	43	99
<8 cm	LBW (<2500 g)	87% (79-94)	60% (55-64)	24	96
<8 cm	Premature (<37 wks)	93% (82-99)	58% (53-62)	15	99
Fifth Day of life ²
Foot length	Outcome
<8 cm	LBW (<2500 g)	77% (74-86)	74% (51-88)	29	96
<8 cm	Premature (<37 wks)	79% (73-85)	72% (44-98)	19	98

¹Small baby outcomes are very low birth weight (<1500 g), low birth weight (<2500 g), and premature (<37 weeks gestation)
²number of very low birth weight babies in fifth day subset was too small to include in analysis

ISSN: 1471-2458