Perinatal variables in reference individuals divided by status of intestinal failure (IF)
| Reference individuals, without IF | Reference individuals, with IF | Fisher’s exact test | |
| N (%) | N (%) | P values* | |
| Total | 3640 (100) | 16 (100) | |
| Variable | |||
| Category | |||
| Gender | |||
| Male | 1999 (54.9) | 7 (43.8) | 0.45 |
| Female | 1641 (45.1) | 9 (56.3) | |
| Degree of prematurity (gestational weeks)† | |||
| 32–42 | 1526 (41.9) | 3 (18.8) | 0.05 |
| 28–31 | 1061 (29.2) | 4 (26.7) | |
| <28 | 1053 (28.9) | 9 (56.3) | |
| Size relative to gestational age (GA)‡ | |||
| LGA and AGA | 3051 (83.8) | 9 (56.3) | <0.01 |
| SGA | 589 (16.2) | 7 (43.8) | |
| Weight category (g) | |||
| ≥1500 | 1838 (50.5) | 5 (31.3) | 0.28 |
| <1500 | 1760 (48.4) | 11 (68.9) | |
| Missing | 42 (1.2) | 0 (0) | |
| Perinatal asphyxia§ | |||
| No | 2903 (79.8) | 13 (81.2) | 0.87 |
| Yes | 587 (16.1) | 3 (18.8) | |
| Missing | 150 (4.1) | 0 (0) | |
| Abdominal surgery¶ | |||
| No | 3564 (97.9) | 10 (62.5) | <0.01 |
| Yes | 76 (2.1) | 6 (37.5) | |
| Birth cohort (year)** | |||
| 1987–1993 | 1049 (28.8) | 3 (18.8) | 0.02 |
| 1994–2001 | 806 (22.1) | 0 (0) | |
| 2002–2006 | 1010 (27.8) | 5 (31.3) | |
| 2007–2009 | 775 (21.3) | 8 (50.0) | |
| Maternal smoking | |||
| No | 3004 (82.5) | 14 (87.5) | 1.00 |
| Yes | 636 (17.5) | 2 (12.5) | |
| Region in Sweden | |||
| Rest of Sweden | 2839 (78.0) | 13 (81.3) | |
| Stockholm county | 801 (22.0) | 3 (18.8) | 0.75 |
*A p value of <0.05 was significant.
†GA in weeks.
‡Size in relation to GA: LGA or AGA, and SGA.
§Apgar <7 at or more than 5 min.
¶According to ICD-9 and ICD-10 procedural codes.
**Based on infant’s birth year.
AGA, appropriate for GA; ICD-9, International Classification of Disease Codes and Related Health Problems, Ninth Revision; ICD-10, International Classification of Disease Codes and Related Health Problems, Tenth Revision; LGA, large for GA; SGA, small for GA.