Statistical analysis
Nominal variables are presented with absolute and relative (%)
frequencies, whereas continuous variables are presented with medians and
interquartile ranges (IQR). To evaluate differences between units and
the effect of intervention, chi-square tests of independence and
Mann-Whitney U tests were performed, as appropriate. Stratified analysis
by unit and type of unit (PHO units located in pediatric compared to
general hospitals) was also performed. All reported p values were
based on two-sided tests, and statistical significance was set atp <0.05. All statistical analyses were performed with
STATA v.13.0 software (StataCorp., College Station, TX, USA).