Probability analysis of radiological criteria as predictors of necrotising enterocolitis or perforation as stratified by birth weight10
| Radiological finding | Group | Sensitivity (%) | Specificity (%) | Positive predicative value (%) | Negative predictive value (%) | Prevalence (%) |
| Pneumatosis | All | 44 (n=27) | 100 (n=19) | 100 | 36 | 34 |
| EX LBW | 35 (n=12) | 100 (n=15) | 100 | 41 | 24 | |
| LBW | 56 (n=15) | 100 (n=4) | 100 | 25 | 48 | |
| Portal venous gas | All | 13 (n=8) | 100 (n=19) | 100 | 26 | 10 |
| EX LBW | 12 (n=4) | 100 (n=15) | 100 | 50 | 8.1 | |
| LBW | 15 (n=4) | 100 (n=4) | 100 | 15 | 13 | |
| Pneumoperitoneum | All | 52 (n=23) | 92 (n=33) | 88 | 61 | 29 |
| EX LBW | 47 (n=15) | 100 (n=17) | 100 | 50 | 31 | |
| LBW | 67 (n=8) | 84 (n=16) | 73 | 80 | 26 | |
| Gasless abdomen | All | 32 (n=14) | 92 (n=33) | 82 | 52 | 18 |
| EX LBW | 41 (n=13) | 82 (n=14) | 81 | 42 | 27 | |
| LBW | 8.3 (n=1) | 100 (n=19) | 100 | 63 | 28 |
EX LBW, extremely low birth weight; LBW, low birth weight.