Origins of control small intestinal tissue samples
| Origin | N (%) |
| Reanastomosis after NEC surgery | 8 (27) |
| Stricture removal after medical NEC | 5 (17) |
| Resection for congenital intestinal atresia | 3 (10) |
| Reanastomosis after congenital volvulus repair | 3 (10) |
| Reanastomosis after SIP repair | 3 (10) |
| Spontaneous intestinal perforation (SIP) | 2 (7) |
| Reanastomosis after gastroschisis repair | 2 (7) |
| Reanastomosis after meconium perforation repair | 1 (3) |
| Gastroschisis with bowel necrosis | 1 (3) |
| Reanastomosis congenital bowel obstruction repair | 1 (3) |
| Adhesion removal after congenital intestinal atresia repair | 1 (3) |
| Total | 30 (100) |
NEC, necrotising enterocolitis.