Rates of conclusive and inconclusive (%) results in different age brackets
| Suction rectal biopsy | Open strip biopsy | P value | |
| 1–2 years, n (%) | |||
| Total | 12 | 5 | 1.000 |
| Conclusive | 10 (83.3) | 5 (100.0) | |
| Inconclusive | 2 (16.7) | 0 (0.0) | |
| 3–4 years, n (%) | |||
| Total | 9 | 9 | 0.471 |
| Conclusive | 9 (100.0) | 7 (77.8) | |
| Inconclusive | 0 (0.0) | 2 (22.2) | |
| ≥5 years, n (%) | |||
| Total | 16 | 5 | 1.000 |
| Conclusive | 15 (93.8) | 5 (100.0) | |
| Inconclusive | 1 (6.3) | 0 (0.0) |