Age , pack-years and smoking status adjusted hazard ratios were 0.992 ( 95 % confidence interval ( CI ) 0.985-0 .999 ) for FEV1 % predicted , 1.000 ( 95 % CI 0.986-1 .015 ) for FEV1/FVC , 1.014 ( 95 % CI 1.005-1 .023 ) for perc15 per 10 HU , and 1.269 ( 95 % CI 1.024-1 .573 ) for pi10 per 1 mm .