Table 5

Multivariate risk of developing NEC by ventilator day periods

Vent. daysNCases (exposed)RR*,†95% CIp ValueMean BW
08398 (3)3.50.82 to 15.150.091262±191
1–279731 (17)1.040.50 to 2.140.921107±216
3–1365072 (49)0.290.7 to 0.51<0.01947±255
>1376163 (47)0.110.06 to 0.23<0.01739±196
  • *Adjusted by gender, race and SGA.

  • †Extended Mantel-Haenszel for linear trend, p<0.01.

  • BW, birth weight; SGA, small for gestational age.