Analysis 2.13.

Comparison 2 Subgroup analysis: formula versus donated breast milk (DBM) given as (i) sole diet or (ii) a supplement to maternal expressed breast milk, Outcome 13 Bayley Mental Development Index at 18 months.

Comparison 2 Subgroup analysis: formula versus donated breast milk (DBM) given as (i) sole diet or (ii) a supplement to maternal expressed breast milk, Outcome 13 Bayley Mental Development Index at 18 months.