TABLE 2.

Patients’ general clinical characteristics.

Patient data (n-206)	Value
Median age years	64.1 ± 7.9
Male/female	196/10
Smokers/non-smokers	150/56
Survival time (months)	28.7 ± 19.3
SpO2%	95.2 ± 3.5
FVC%pred	71.9 ± 20.1
FEV1%pred	75.1 ± 20.6
DLco%pred	52.0 ± 28.4
FEV1/FVC%	83.5 ± 7.8
CT score values by AI	14.1 ± 11.30
CT score values by radiologists	24.5 ± 13.8
CT stage I/II/III	56/114/36
PF stage a/b/c	95/80/31
GAP stage I/II/III	108/63/35
CPI	44.6 ± 21.0

Notes: Measurement data are presented as mean ± standard deviation (SD). Count data are presented as percentage or proportion.

SpO₂%: oxygen saturation of peripheral blood. SpO₂ is the resting arterial oxygen saturation measured at fingertips. FVC: forced vital capacity. FVC%pred: the percentage of the actual FVC over the predicted FVC. FEV₁: forced expiratory volume in one second. FEV₁%pred: the percentage of the actual FEV₁ over the predicted FEV₁. DLco: diffusing capacity of the lung for carbon monoxide. DLco%pred: the percentage of the actual DLco over the predicted DLco. FEV₁/FVC%: the percentage of FEV₁ over FVC. CT score values were calculated by AI according to the method in the article. CT-based stage: the stage was determined by using CT score values by AI following the criteria described in Table 3. PF-based grade: the grade was determined by using the pulmonary function and physiological parameters (age, gender, FVC%pred, DLco%pred, and SpO2%) and following the description in Table 3. The grade was defined as (a) mild, (b) moderate, and (c) severe. GAP (gender, age, and physiologic variables) stage followed the recommendation by Brett Ley, and a higher stage represented a greater death risk. CPI: composite physiologic index. In 2002, Athol U. Wells and others proposed to use CPI, which combined chest CT and pulmonary functional parameters, to assess the severity of interstitial lung diseases (ILDs). A higher CPI represents a more severe ILD.