Table 2.

Experiment with different dead space and volumes: levels of EtCO₂ for different tidal volumes and dead space, and then levels of EtCO₂ with different rates of inflation per minute (ipm) and dead space

Volume (ml/kg)	EtCO2 (mmHg) 0 ml dead spacea	EtCO2 (mmHg) 20 ml dead spacea	p value
6	7.0 (5.3–7.8)	5.2 (4.3–6.0)	0.066
10	5.9 (4.8–7.2)	5.0 (4.2–6.2)	0.068
15	4.6 (4.1–5.9)	5.1 (3.6–5.5)	0.465

Dead space (ml)	EtCO2 at rate 20 (ipm)	EtCO2 at rate 40 (ipm)	p value
0	6.5 (5.2–7.4)	6.1 (4.5–7.0)	0.144
20	5.2 (3.4–6.2)	5.1 (4.2–6.2)	0.655

^aResults are given as median (range)