FEV1/FVC <0.80 Predictor Odds ratio 95% Confidence Limit Age above median >29 years 3.86 3.39 – 4.40 Height above median >67 inches 1.48 1.30 – 1.70 Smoking History (effect of non-smoking) 0.57 0.51 – 0.65 Boat Manufacturer Status 1.30 0.97 – 1.74

Table 6: Logistic Regression Analysis of FEV1/FVC to Examine the Effect of Predictors on Producing an Abnormal Ratio (<0.80 FEV1/FVC).