Table 2 Comparison the chest DECT parameters between limited CTD-ILD and extensive CTD-ILD
|  | Limited CTD-ILD | Extensive CTD-ILD | t /χ2 | p |
|---|---|---|---|---|
Total-No | 89 | 39 | Â | Â |
Age (year) | 49.44 ± 9.27 | 51.64 ± 11.55 | − 1.146 | .254 |
BMI (kg/m2) | 23.49 ± 3.09 | 22.53 ± 3.64 | 1.515 | .132 |
Female, No. (%) | 78 (87.6%) | 38 (97.4%) | 3.062 | .080 |
Han nationality, No. (%) | 86 (96.6%) | 35 (89.7%) | 2.487 | .115 |
Former/current smoker, No. (%) | 14 (15.7%) | 0 (0) | 6.888 | .009 |
Comorbidity, No. (%) | 52 (58.4%) | 24 (61.5%) | 0.109 | .741 |
Lung volume (cm3) | 3475.21 ± 971.62 | 2309.51 ± 668.98 | 7.844 | .000 |
 V_RL | 607.08 ± 275.18 | 278.39 ± 136.74 | 9.012 | .000 |
 V_RM | 377.19 ± 138.00 | 287.47 ± 144.82 | 3.335 | .001 |
 V_RU | 901.38 ± 249.48 | 742.69 ± 262.74 | 3.259 | .001 |
 V_LL | 548.31 ± 255.13 | 254.51 ± 120.13 | 8.853 | .000 |
 V_LU | 1041.24 ± 284.10 | 746.45 ± 316.93 | 5.215 | .000 |
Average Zeff value | 2.256 ± 0.435 | 3.104 ± 0.569 | − 8.311 | .000 |
 Z_RL | 2.682 ± 0.653 | 3.828 ± 0.813 | − 8.470 | .000 |
 Z_RM | 2.018 ± 0.382 | 2.833 ± 0.692 | − 6.906 | .000 |
 Z_RU | 1.911 ± 0.327 | 2.501 ± 0.567 | − 6.071 | .000 |
 Z_LL | 2.706 ± 0.663 | 3.792 ± 0.698 | − 8.398 | .000 |
 Z_LU | 1.961 ± 0.334 | 2.566 ± 0.629 | − 5.664 | .000 |
Average MCTN (HU) | − 802.20 ± 40.27 | − 722.87 ± 52.83 | − 8.373 | .000 |
 MCTN_RL | − 760.08 ± 63.10 | − 654.62 ± 75.83 | − 8.173 | .000 |
 MCTN_RM | − 825.56 ± 35.10 | − 749.33 ± 61.82 | − 7.209 | .000 |
 MCTN_RU | − 836.07 ± 29.22 | − 781.03 ± 54.10 | − 5.982 | .000 |
 MCTN_LL | − 757.79 ± 63.46 | − 654.72 ± 69.34 | − 8.221 | .000 |
 MCTN_LU | − 831.51 ± 28.42 | − 774.64 ± 60.19 | − 5.631 | .000 |