Meta-analyses, conducted through RevMan, compared
standardised differences in means using DerSimoniane
Laird random effects28 29 as the principal analyses to
allow for systematic differences in effects estimated
across the included trials.19 29 Ninety-five per cent
confidence intervals were reported for summary
statistics. For comparisons across trials that reported
different measurement tools for the same outcome19
or a mixture of final value scores and change from
baseline scores, standardised mean differences were
selected