Figure 6. Box-whisker plot of mean glandular dose (MGD) per woman for different ethnic groups; Malay (n=100), Chinese (n=100), and Indian (n=100). The 25th and 75th percentile marks the box and whiskers extend to the range outliers excluded. The median is marked in the box. The median, which is not central, represents the study population, which is not normally distributed. The open circles (o) are outliers that represent cases that have values of more than 1.5 box-lengths from the 75th percentile. The asterisks (*) are extreme values that represent cases that have values of more that three box-lengths from the 75th percentile.