Table 2

Comparison of selected variables between groups.

  • Vt = tidal volume; Ti = inspiratory time; Te = expiratory time; Tt = cycle duration; f = respiratory frequency; V˙ = minute ventilation; Petco 2 = end tidal Pco 2; Paco 2 = arterial Pco 2; a–ET = difference between arterial and end tidal Pco 2, Pao 2 = arterial Po 2; pH = acidity of arterial blood; HCO3 = bicarbonate of arterial blood; BE = base excess of arterial blood; FEV1 = forced expired volume in one second; FEV1/VC = ratio of FEV1 to vital capacity; PEF = peak expiratory flow; Tlco = single breath carbon monoxide gas transfer; Kco = gas transfer corrected for total lung volume; TLC = total lung capacity; RV = residual volume; PC20 = concentration of methacholine at 20% reduction of FEV1; BDI = Beck Depression Inventory scores; Anxiety state and trait = scores from Spielberger STAI.

  • 2-150 p<0.05,

  • 2-160 p<0.01 for comparison between groups.