Age, mean (SD)

47.2 (16.2)

46.5 (14.8)

46.9 (15.5)

Females, number (%)

77 (63.1)

85 (70.2)

162 (66.7)

Severity score of the common cold at baseline, mean (SD)

3.3 (1.9)

3.1 (2.0)

3.2 (1.9)