Fig. 1
Box Plot of Pain Scores Over Time in Children with Persisting Pain (Cases) Versus those with Decreasing Pain (Controls). The length of the box represents the interquartile range (the distance between the 25th and 75th percentiles). The circle within the box represents the control group mean and the cross within the box represents the case group mean. The horizontal line within the box represents the group median. The vertical lines, or ‘whiskers’, are drawn to the most extreme points in the group that lie within the fences. The upper fence is defined as the third quartile (represented by the upper edge of the box) plus 1.5 times the interquartile range (IQR). The lower fence is defined as the first quartile (represented by the lower edge of the box) minus 1.5 times the interquartile range. Visit N = visit number. Visit 1 = initial visit, visit 2 = 6-month visit, visit 3 = 12-month visit, visit 4 = 18-month visit, visit 5 = 2-year visit, visit 6 = 3-year visit, visit 7 = 4-year visit, visit 8 = 5-year visit