Table 2 . Infants’ characteristics in relation to body weight.
| ≤1,499 g n=67 |
1,500–2,499 g n=83 |
≥2,500 g n=138 |
p value | |
|---|---|---|---|---|
| Gestational age (weeks) | 29 (22–38) | 36 (23–39) | 39 (26–42) | <.01 a, b, c |
| Postnatal age (days) | 10 (0–166) | 1 (0–445) | 3 (0–1,303) | <.01 a |
| Catheter type | ||||
| PIVC | 15 (22.4) | 42 (50.6) | 80 (58.0) | <.01 i, iii |
| PICC | 55 (82.1) | 48 (57.8) | 66 (47.8) | <.01 i, iii |
| 8-cm PICC | 4 (6.0) | 1 (1.2) | 4 (2.9) | .33 |
| CVC | 0 (0.0) | 2 (2.4) | 7 (5.1) | .14 |
| UVC | 4 (6.0) | 1 (1.2) | 0 (0.0) | <.01 |
| UAC | 4 (6.0) | 1 (1.2) | 0 (0.0) | <.01 |
| PAC | 6 (9.0) | 6 (7.2) | 10 (7.2) | .92 |
| Number of catheter types | .16 | |||
| One | 49 (73.1) | 69 (83.1) | 118 (85.5) | |
| Two | 15 (22.4) | 10 (12.0) | 12 (8.7) | |
| Three | 3 (4.5) | 4 (4.8) | 7 (5.1) | |
| Four | 0 (0.0) | 0 (0.0) | 1 (0.7) | |
Data are presented as the median (minimum–maximum) or as n (%).
The p values for gestational age and postnatal age were analyzed using the Kruskal–Wallis test, and post hoc multiple comparisons were conducted using Dunn’s test with the Bonferroni method.
The p values for catheter type (PIVC, PICC) were compared using the χ2 test, and residual analysis was performed for between-group comparisons when appropriate.
The p values for other categorical variables were analyzed using Fisher’s exact test.
a p<.01 for ≤1,499 g vs 1,500–2,499 g, b p<.01 for ≤1,499 g vs ≥2,500 g, c p<.01 for 1,500–2,499 g vs ≥2,500 g.
i p<.01 for ≤1,499 g vs other groups, ii p<.01 for 1,500–2,499 g vs other groups, iii p<.01 for ≥2,500 g vs other groups.
PIVC: peripheral intravenous catheter; PICC: peripherally inserted central catheter; CVC: central venous catheter; UVC: umbilical venous catheter; UAC: umbilical arterial catheter; PAC: peripheral arterial catheter.