Site performance dispersion by PMTCT program: Nevirapine Coverage Ratios (NCR). Boxplots are displayed for programs including at least two sites (n=14) as follows: the median is represented by a horizontal line within each box, which represents the interquartile range (IQR) comprising data between the 25th and 75th percentiles. Whiskers extend to the 1.5*IQR beyond each box and circles represent outliers.
Audureau et al. BMC Public Health 2013 13:286 doi:10.1186/1471-2458-13-286