Table 6.

Results from using only the breath hold test (BHT) < 20 seconds as a potential screen to predict those with DB.

	Dysfunctional Breathing Present	Dysfunctional Breathing Absent
BHT < 20 sec	25	2
BHT > 20 sec	21	3

Dysfunctional Breathing defined as any one of the following:

Resting End-Tidal CO of < 35mmHg

Positive Hi Lo Breathing Assessment

Scoring above the threshold on either the Self-Evaluation of Breathing Symptoms Questionnaire (>25) or the Nijmegen Breathing Questionnaire (>22)

Sensitivity = 0.54 (0.50-0.58)

Specificity = 0.60 (0.18-0.93)

Positive LR = 1.36 (0.60-7.82)

Negative LR = 0.76 (0.46-2.85)