Table 1.
Characteristics of 79 consecutive patients with COPD and Spearman’s rank correlation coefficients between the total Kihon Checklist scores and those of clinical indices
| Variable | n | Mean±SD | Range | Rs | p Value |
| Age (years) | 79 | 74.8±6.3 | 60–88 | 0.006 | 0.96 |
| BMI (kg/m2) | 79 | 22.4±3.1 | 13.6–30.7 | 0.097 | 0.39 |
| Cumulative smoking pack-years | 79 | 57.4±31.4 | 10–204 | −0.12 | 0.30 |
| VC (L) | 79 | 3.14±0.73 | 1.76–5.61 | −0.34* | <0.01 |
| VC (% pred) | 79 | 96.5±17.5 | 59.1–138.5 | −0.24* | 0.04 |
| FVC (L) | 79 | 3.09±0.74 | 1.73–5.34 | −0.34* | <0.01 |
| FVC (% pred) | 79 | 97.8±18.6 | 53.5–138.0 | −0.21 | 0.07 |
| FEV1 (L) | 79 | 1.72±0.56 | 0.49–3.08 | −0.33* | <0.01 |
| FEV1 (% pred) | 79 | 69.3±20.4 | 21.1–114.1 | −0.15 | 0.19 |
| FEV1/FVC (%) | 79 | 55.4±11.0 | 21.9–61.0 | −0.13 | 0.24 |
| IC (L) | 79 | 2.10±0.56 | 1.02–3.97 | −0.17 | 0.13 |
| IC/TLC (%) | 79 | 37.9±11.0 | 10.9–83.8 | −0.01 | 0.93 |
| TLC (% pred) | 79 | 107.3±27.6 | 48.5–238.6 | −0.19 | 0.09 |
| DLCO (mL/min/mmHg) | 79 | 11.61±4.63 | 1.72–25.84 | −0.29* | 0.01 |
| DLCO (% pred) | 79 | 50.7±19.1 | 7.6–101.4 | −0.24* | 0.03 |
| DLCO/VA (mL/min/mmHg/L) | 79 | 2.59±0.93 | 0.23–4.29 | −0.14 | 0.22 |
| PaO2 (mmHg) | 79 | 78.5±9.0 | 56.6–94.8 | −0.16 | 0.15 |
| CAT score | 79 | 8.2±7.1 | 0–31 | 0.38* | <0.01 |
| SGRQ | |||||
| Symptom | 79 | 37.5±19.1 | 2.7–90.3 | 0.26* | 0.02 |
| Activity | 79 | 31.6±26.8 | 0.0–93.3 | 0.63† | <0.01 |
| Impacts | 79 | 13.4±16.3 | 0.0–76.7 | 0.63† | <0.01 |
| Total | 79 | 22.8±18.0 | 1.9–83.7 | 0.65† | <0.01 |
| SF-36 | |||||
| Physical functioning | 73 | 41.1±15.0 | −7.1–57.8 | −0.60† | <0.01 |
| Role physical | 73 | 41.5±13.6 | 2.6–55.7 | −0.33* | <0.01 |
| Bodily pain | 73 | 50.4±10.8 | 26.9–61.7 | −0.49† | <0.01 |
| General health | 73 | 45.8±9.5 | 19.1–68.2 | −0.64† | <0.01 |
| Vitality | 73 | 51.5±9.8 | 24.1–69.1 | −0.59† | <0.01 |
| Social functioning | 73 | 49.1±10.7 | 18.4–57.0 | −0.53† | <0.01 |
| Role emotional | 73 | 45.7±13.0 | 6.1–56.1 | −0.31* | <0.01 |
| Mental health | 73 | 50.8±9.8 | 27.7–65.2 | −0.51† | <0.01 |
| Hyland Scale score | 79 | 66.6±16.9 | 20–100 | −0.54† | <0.01 |
| BDI score | 77 | 8.9±2.4 | 0–12 | −0.46† | <0.01 |
| D-12 score | 78 | 1.6±4.0 | 0–23 | 0.41† | <0.01 |
Data are presented as mean±SD. A p value <0.05 was interpreted as statistically significant,
*Weak correlation coefficients (0.20–0.40).
†Moderate correlation coefficients (0.40–0.70).
% pred, percentage predicted; BDI, Baseline Dyspnea Index; BMI, body mass index; CAT, COPD Assessment Test; COPD, chronic obstructive pulmonary disease; D-12, Dyspnea-12.; DLCO, diffusing capacity of the lungs for carbon monoxide; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; IC, inspiratory capacity; PaO2, partial pressure of arterial oxygen; SF-36, Medical Outcomes Study 36-item short-form; SGRQ, St. George’s Respiratory Questionnaire; TLC, total lung capacity; VA, alveolar volume; VC, slow vital capacity.