Endpoint
Severe bronchopulmonary dysplasia, dichotomised at 36 weeks
CAT:outcome/severe-bpd-at-36-weeksreported in risk ratio
How it is measured
Severe bronchopulmonary dysplasia at 36 weeks postmenstrual age as a BINARY endpoint. The grading classification is recorded with each finding and is required: the NIH consensus definition and Jensen's respiratory-support definition disagree about which infants are severe, and a study may also use its own. Where a paper states no classification, that is an unstated instrument rather than a near miss.