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Table 2 Inhalation parameters before enhanced training

From: Inhalation characteristics of asthma patients, COPD patients and healthy volunteers with the Spiromax® and Turbuhaler® devices: a randomised, cross-over study

  Children with asthma (n = 23) Adolescents with asthma (n = 27) Adults with asthma (n = 50) Adults with COPD (n = 50) Healthy adults (n = 50)
Spiromax
PIF, L/min 69.5 67.9 74.4 57.5 85.0
(17.2) (15.1) (18.1) (21.0) (13.6)
Max ΔP, kPa 5.0 4.7* 5.7* 3.7 7.3
(2.4) (2.2) (2.6) (2.7) (2.3)
ACC, kPa/s 13.6 12.1 15.6 11.0* 15.9*
(11.8) (8.8) (15.7) (12.8) (13.5)
Inhalation volume, L 1.50 2.03 2.39 1.82 2.98*
(0.6) (0.81) (1.03) (0.88) (1.02)
Turbuhaler
PIF, L/min 58.5 57.8 65.4 50.1 78.0
(14.7) (13.4) (17.5) (16.2) (11.8)
Max ΔP, kPa 3.9 3.9 5.1 3.1 7.0
(2.0) (1.8) (2.6) (2.0) (2.1)
ACC, kPa/s 10.2 11.4 13.0 8.4 12.8
(7.7) (7.2) (12.1) (9.5) (9.6)
Inhalation volume, L 1.25 1.68 2.13 1.58 2.80
(0.57) (0.74) (1.01) (0.69) (0.92)
  1. Data shown are mean (standard deviation). *p < 0.05 vs Turbuhaler; p < 0.01 vs Turbuhaler; p ≤ 0.0001 vs Turbuhaler.