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[[file:normal respiration markup.png]]

The usual way of expressing the I:E ratio is to compare inspiration time to expiration time. The best statistic to use for calculating the I:E Ratio is the median inspiration and expiration times. For example median values from your data, assume your inspiratory time is 1.54 and expiratory time is 2.88. 2.88/1.54=1.87, or a ratio of 1 to 1.87 (Also expressed as 1:1.87). In this case, the expiration is nearly twice as long as inspiration which is normal. In general, the I:E ration will range from 1:1 to 1:3, meaning normal exhale can be in a range of equal to 3 times the time of inhale.