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

From: 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

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