Significant contributors to unilateral patency ratings (forward step-wise multiple regressions).

The dependent variable was unilateral nasal subjective patency; the independent variable pool consisted of exposure air temperature and humidity, nasal heat loss, butanol detection threshold, nasal resistance, and MCA (minimum airway cross-sectional area as measured by acoustic rhinometry). Criterion for a variable to enter the regression, F>1; to be removed, F<0.5; total steps = 5. Final regression model consist of two significant variables: r = 0.43, R2 = 0.187, adjusted R2 = 0.168, F(4,175) = 10.021; p<0.00001.