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. 2007 Dec;16(6):390–393. doi: 10.1136/tc.2007.021097

Table 1 Spirometery data obtained from analysis of real life smoking pattern.

Tidal volume of an inhalation breath (litres) Duration of a breath (seconds) Interval duration between breaths (seconds)
Median 1.0 5.0 25.5
SD 0.47 2.4 10.2
Number 565 565 565