FIGURE 2.

Comparison of age, duration of clinical signs, duration of hospitalization postoperatively, and time interval to follow‐up between horses treated with unilateral and single caudally based bilateral frontonasal sinusotomy. (a) Age did not differ between horses with unilateral and bilateral disease (p = 0.19).  Median age of horses with unilateral disease was 17 years (interquartile ranges (IQR): 11–20 years). Median age of horses with bilateral disease was 11 years (IQR: 6–17 years).  (b) Duration of clinical signs prior to admission did not differ between horses with unilateral and bilateral disease (p = 0.09), but there was a tendency for horses with bilateral disease to have clinical signs for a longer time period. Median length of clinical signs prior to hospitalization and sinusotomy was 3 months (IQR: 2–9 months) for horses with unilateral disease and 12 months (IQR: 3–66 months) for horses with bilateral disease. (c) Duration of hospitalization did not differ between horses undergoing unilateral or bilateral procedures (p = 0.53). Median duration of hospitalization of horses undergoing unilateral procedures was 5 days (IQR: 4–9 days). Median duration of hospitalization of horses undergoing bilateral procedures was 4 days (IQR: 3–8 days).  (d) Follow‐up interval was not different between horses undergoing unilateral and bilateral procedures (p = 0.28). Median follow‐up time for horses undergoing unilateral procedures was 21 months (IQR: 13–37 months). Median follow‐up time for horses undergoing bilateral procedures was 14 months (IQR: 9–24 months)