Validity and reliability of the persian version of the dyspnea-12 questionnaire in assessing dyspnea among COPD patients

Table 4 Association between Pulmonary Function Test Parameters and Dyspnea-12 Scores

Pulmonary function test parameter^║	Dyspnea-12 Score					η²	P-value
Pulmonary function test parameter^║	0–5	6–9	10–20	20–30	> 30	η²	P-value
FEV1 (percent), Mean ± SD	76.65 ± 20.04	78.23 ± 25.59	67.45 ± 23.55	62.78 ± 19.07	52 ± 23.64	0.093	0.042
FVC (percent), Mean ± SD	85.35 ± 15.07	83.62 ± 19.5	75.52 ± 19.03	75.78 ± 15.58	58.67 ± 5.51	0.112	0.017
FEV1/FVC, Mean ± SD	70.43 ± 11.92	73.85 ± 13.34	70.21 ± 13.65	66.65 ± 17.36	67.67 ± 25.5	0.023	0.678
RV (percent), Mean ± SD	106.38 ± 17.7	106.77 ± 17.5	103.76 ± 17.88	114.26 ± 24.31	108.67 ± 19.35	0.085	0.408
TLC (percent), Mean ± SD	147.3 ± 41.82	148.46 ± 45.83	155.1 ± 42.87	184.43 ± 71.79	186.67 ± 64.38	0.039	0.063
RV/TLC (percent), Mean ± SD	132.51 ± 22.08	135.15 ± 26.05	144.86 ± 26.94	149 ± 43.6	167.67 ± 25.42	0.074	0.1

FEV₁ Forced Expiratory Volume in one second, FVC Forced Vital Capacity, TLC Total Lung Capacity, RV Residual Volume
^║Analyses carried out using One-way Analysis of Variance; η² = Eta squared (effect size); * p < 0.05

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