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. Author manuscript; available in PMC: 2022 Sep 1.
Published in final edited form as: J Pediatr. 2021 May 15;236:78–85.e5. doi: 10.1016/j.jpeds.2021.05.022

Figure 4.

Figure 4.

Estimated effect of vitamin A therapy by continuous risk of bronchopulmonary dysplasia or death

The effect of vitamin A therapy varied by infants’ predicted risk of bronchopulmonary dysplasia or death. Relative risk reduction was calculated as 1-relative risk. Relative risks were estimated using a log-binomial model that included an interaction term for predicted risk (continuous) and treatment assignment (binary). Absolute risks were estimated using a linear-binomial model in the same form.