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Table 4 Relativity between PIFR0 and clinical indicators

From: Optimizing inhalation therapy in the aspect of peak inhalation flow rate in patients with chronic obstructive pulmonary disease or asthma

Clinical indicators p value R (95% CI)
Sex 0.061 −0.130 (−0.261, 0.016)
BMI 0.312 0.071 (−0.076, 0.248)
FEV1 0.013* 0.199 (0.072, 0.351)
FEV1, %predicted 0.900 −0.010 (−0.172, 0.149)
FEV1/FVC 0.948 0.005 (−0.149, 0.169)
PEF 0.008* 0.218 (0.097, 0.356)
IC 0.001* 0.284 (0.097, 0.422)
RV/TLC 0.255 −0.098 (−0.296, 0.084)
CAT 0.632 −0.047 (−0.230, 0.162)
mMRC 0.005* −0.200 (−0.346, −0.044)
  1. Except for FEV1 (%predicted), which is the percentage of predicted value, the other pulmonary function parameters are absolute values
  2. r, Spearman rank correlation coefficient; BMI, body mass index; FEV1, forced expiratory volume in 1 s; FEV1%, FEV1/predicted FEV1; FEV1/FVC, forced expiratory volume in 1 s/forced vital capacity; PEF, peak expiratory flow; IC, inspiratory capacity; RV/TLC, residual volume/total lung capacity; CAT, COPD Assessment Test; mMRC, Medical Research Council Dyspnea Scale.
  3. *p value < 0.05