| Univariate | Multivariate | ||||
---|---|---|---|---|---|---|
 | HR | 95 % CI | P | HR | 95 % CI | P |
Quantitative CT indices | Â | Â | Â | Â | Â | Â |
 HAA% (>-200 HU), % | 1.47 | (1.13 – 1.83) | < 0.01 | 1.06 | (0.86 – 1.06) | NS |
 LAA% (<-960 HU), % | 0.97 | (0.86 – 1.06) | NS |  |  |  |
 CA%, % | 0.98 | (0.75 – 1.16) | NS |  |  |  |
 MLD, HU | 1.01 | (1.00 – 1.02) | 0.01 |  |  |  |
 SD-LD, HU | 1.03 | (1.01 – 1.04) | < 0.01 |  |  |  |
 Kurtosis | 0.67 | (0.51 – 0.86) | < 0.01 | 0.67 | (0.44 – 0.96) | 0.03 |
 Skewness | 0.28 | (0.11 – 0.65) | < 0.01 |  |  |  |
CT visual scores | Â | Â | Â | Â | Â | Â |
 GGO score | 0.74 | (0.35 – 1.40) | NS |  |  |  |
 Fibrosis score | 2.00 | (1.20 – 3.39) | 0.01 | 1.06 | (0.45 – 2.21) | NS |
Definite UIP pattern | 2.13 | (1.05 – 4.47) | 0.04 | 2.36 | (0.84 – 7.60) | NS |