Longer duration of initial invasive mechanical ventilation is still a crucial risk factor for moderate-to-severe bronchopulmonary dysplasia in very preterm infants: a multicentrer prospective study.

The incidences of moderate-to-severe BPD in very preterm infants showed a decreasing trend with increasing GA, from 68.4% (13/19) at 23–24 weeks to 3.9% (74/1875) at 31 weeks of GA (Table 1 ).About 49.5% (3236/6538) of patients required initial IMV support, while that in moderate-to-severe BPD cases was 89.1% (733/823).

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