Multivariate risk of developing NEC by UAC insertion day periods
| UAC days | N | Cases (exposed) | RR*,† | 95% CI | p Value | Mean BW |
|---|---|---|---|---|---|---|
| 0 | 1352 | 52 (28) | 2.11 | 1.2 to 3.69 | <0.01 | 1173±253 |
| 1–2 | 184 | 12 (8) | 1.44 | 0.41 to 5.12 | 0.31 | 1052±259 |
| 3–7 | 707 | 53 (37) | 0.81 | 0.44 to 1.49 | 0.49 | 989±243 |
| >7 | 804 | 57 (43) | 0.2 | 0.1 to 0.39 | <0.01 | 796±234 |
*Adjusted by gender, race and SGA.
†Extended Mantel-Haenszel for linear trend, p<0.01.
BW, birth weight; SGA, small for gestational age; UAC, umbilical arterial catheter.