Rates of conclusive and inconclusive (%) results in <1 year old compared with >1 year old
| Suction rectal biopsy | Open strip biopsy | P value | |
| <1 year, n (%) | |||
| Total | 20 | 3 | 1.000 |
| Conclusive | 14 (70.0) | 2 (66.7) | |
| Inconclusive | 6 (30.0) | 1 (33.3) | |
| ≥1 year, n (%) | |||
| Total | 37 | 19 | 1.000 |
| Conclusive | 34 (91.9) | 17 (89.5) | |
| Inconclusive | 3 (8.1) | 2 (10.5) |