Pooled sensitivity and specificity for all available foot length thresholds to identify low birthweight neonates (<2500 g and <2000 g)
| Birth weight cut-off | Foot length cut-off (cm) | N, for pooling | Pooled sensitivity (%) (95% CI) | Pooled specificity (%) (95% CI) |
| Africa | ||||
| <2500 g | <7.6 | 2 | 86.9 (82.9 to 90.2) | 74.1 (58.6 to 85.3) |
| <7.7 | 3 | 84.6 (80.3 to 88.2) | 73.5 (46.7 to 89.8) | |
| <7.9 | 3 | 92.0 (85.6 to 95.7) | 71.9 (44.5 to 89.1) | |
| Asia | ||||
| <2500 g | <7.2 | 2 | 40.2 (27.9 to 53.9) | 89.3 (67.3 to 90.8) |
| <7.3 | 3 | 59.7 (37.9 to 78.3) | 80.8 (57.2 to 93.0) | |
| <7.4 | 3 | 69.6 (43.9 to 87.0) | 79.9 (55.7 to 92.6) | |
| <7.5 | 2 | 70.3 (42.3 to 88.5) | 66.4 (32.7 to 88.9) | |
| <7.6 | 2 | 80.7 (55.2 to 93.5) | 55.0 (23.2 to 83.3) | |
| <7.7 | 3 | 87.6 (55.7 to 97.5) | 70.9 (23.5 to 95.1) | |
| <7.8 | 2 | 92.7 (61.1 to 99.0) | 33.9 (11.2 to 67.7) | |
| <2000 g | <6.8 | 4 | 58.4 (29.4 to 82.6) | 96.0 (90.0 to 98.5) |
| <6.9 | 3 | 48.9 (30.9 to 67.2) | 95.4 (86.9 to 98.5) | |
| <7.0 | 3 | 57.7 (32.2 to 79.7) | 93.0 (80.9 to 97.6) | |
| <7.1 | 3 | 67.5 (55.7 to 77.5) | 87.8 (63.9 to 96.7) | |
| <7.2 | 3 | 79.6 (67.2 to 88.1) | 85.7 (65.7 to 94.9) | |
| <7.3 | 3 | 82.1 (63.7 to 92.2) | 82.1 (59.2 to 90.8) | |
| <7.4 | 3 | 85.1 (66.2 to 94.4) | 76.0 (50.0 to 90.8) | |
| <7.5 | 3 | 88.6 (73.9 to 95.5) | 69.4 (41.8 to 87.7) | |