Table 2.

Results of linear regression analyses adjusted for BMI

Dependent Variable	Coefficient for Age groups: Elderly vs. Young (Reference)	Coefficient for Gender: Female vs. Male (Reference)
Apneic threshold, mmHg	−3.2, P = 0.05*	0.7, P = ns
CO2 reserve, mmHg	−1.3, P = 0.02*	−1.0, P = 0.07
Controller gain, l·min−1·mmHg−1	0.9, P = 0.004*	0.3, P = ns
Eupneic CO2, mmHg	−4.2, P = 0.01*	−1.2, P = ns
Eupneic V̇e, l/min	1.5, P = 0.01*	−2.0, P = 0.001*
Plant gain, mmHg·l−1·min	−0.9, P = 0.04	0.5, P = ns

^*Denotes significant coefficient.