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Figure 7: Different nomograms that have been proposed to categorize BOO. The red lines on ‘a’ and ‘d’ separating the obstructed region are identical. The equivalent line is shown as a dotted red line on ‘b’ and ‘c’ and is almost identical to the line separating grade II and grade III on the Schäfer nomogram ‘b’. X is a patient with Qmax of 10 ml/s and pdet.Qmax of 100 cmH2O categorized throughout as obstructed.

Figure 7: Different nomograms that have been proposed to categorize BOO. The red lines on ‘a’ and ‘d’ separating the obstructed region are identical. The equivalent line is shown as a dotted red line on ‘b’ and ‘c’ and is almost identical to the line separating grade II and grade III on the Schäfer nomogram ‘b’. X is a patient with Qmax of 10 ml/s and pdet.Qmax of 100 cmH2O categorized throughout as obstructed.