Table 3

 Comparison of response to the added dead space of infants of smoking and non-smoking mothers

Infants of smoking mothersInfants of non-smoking mothersp Value
Data are median (range).
MMV, Maximum minute ventilation; MV, minute volume; Tc, time constant.
Baseline MV (ml/min/kg)150 (119–275)164 (80–263)0.71
MMV (ml/min/kg)400 (262–631)349 (192–518)0.26
Change in MV (%)120.8 (84.3–216.7)164.3 (80–263)0.09
Tc of the response (seconds)37.3 (22.2–70.2)26.2 (13.8–41.9)0.016