Figure 1
From: Validation of a short form Wisconsin Upper Respiratory Symptom Survey (WURSS-21)
Data shown represent Day 2 to Day 12. Sample size diminishes as participants’ colds resolve, from N=228 on Day 2 to N=100 on Day 12.
The center of the notched boxes is the median summed score for that day. The notches portray the median ± 1.57 (interquartile range=IQR) / N-2 and thus can be compared to assess difference at the P = 0.05 level of significance.
The top of the notched boxes indicate the 25% and 75% percentiles, respectively. The ends of the vertical lines indicate the last actual data point within 1.5 (IQR) from the 25%ile and 75%ile. The symbols above and below these lines are actual outlying data points.