Table 4: Multivariate analysis predicting BPD for the entire cohort controlled by city of birth 𝑁 = 2 1 2 .

VariablesOR95% CI

Preterm premature rupture of membranes1.171.051.31
Ventilatory support (nCPAP + MV)1.181.011.38
Use of surfactant (rescue)1.631.282.08
Use of surfactant (no surfactant)1.371.121.67
City of birth (Bogotá)11.91.462.49
F I O 2 1 (median value)1.581.112.26
PDA1.141.011.28
Sepsis1.121.011.26

1OR adjusted by interaction term between Bogota and FIO2.