Suppose that in the phototherapy example, the co-intervention of switching to formula had been ascertained, but the overall sample is considerably smaller, with only 32 outcome events, rather than...

Suppose that in the phototherapy example, the co-intervention of switching to formula had been ascertained, but the overall sample is considerably smaller, with only 32 outcome events, rather than 128. What approach would you use for estimating the effect of phototherapy, and why?