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Thorax 53:768-774 doi:10.1136/thx.53.9.768
  • Original article

Exertional dyspnoea in patients with airway obstruction, with and without CO2 retention

Table 5

Relation between change in tidal volume (Vt) and change in pressure swing (Ptot) by analysis of covariance for the total group

Relation between ΔVt and ΔPtot Coefficient p value
Intercept (β0) 0.97 0.000
Group (β1) −0.42 0.208
ΔPtot (β2) 0.09 0.161
ΔPtot × group (β3) −0.10 0.254
  • No significant relation was found in the total group nor in one group compared with the other.

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