Table 3—

Pearson correlation coefficients for peak (PI,peak) and plateau maximal inspiratory mouth pressures measured at residual volume (RV) and functional residual capacity (FRC)

Variable P I,max,0.5 P I,max,1.0 P I,max,0.1
RV
 Females P I,peak 0.97#0.94#0.52#
P I,max,0.5 0.98#0.50#
P I,max,1.0 0.51#
 Males P I,peak 0.97#0.94#0.56#
P I,max,0.5 0.97#0.54#
P I,max,1.0 0.53#
FRC
 Females P I,peak 0.98#0.94#0.51#
P I,max,0.5 0.97#0.51#
P I,max,1.0 0.50#
 Males P I,peak 0.96#0.93#0.48#
P I,max,0.5 0.97#0.48#
P I,max,1.0 0.53#
  • Data represent 533 subjects (304 females and 229 males)

  • PI,max,0.5: plateau maximal inspiratory mouth pressure sustained for 0.5 s

  • PI,max,1.0: plateau maximal inspiratory mouth pressure sustained for 1.0 s

  • PI,max,0.1: maximal inspiratory mouth pressure 100 ms after start of maximal inspiratory manoeuvre

  • #: p<0.0001