Table 3. Comparison of diagnostic measures between DQ and patient documentation based on patient population.

Diagnostic measures		Patients recruited by physicians who reported use of the measure	Patients in whom the measures were performed
			Physicians who reported routine use of the measure	Physicians who reported not to routinely use the measure
		N = 249 (%)	% of patients	% of patients	P-value *
Body plethysmography		249 (100)	72.7	–	–  **
Chest X-ray		242 (97.2)	41.7	0	0.0436
Spirometry		211 (84.7)	30.3	34.2	0.7035
COPD Assessment Test		199 (79.9)	67.8	38.0	0.0002
AATD screening		210 (84.3)	1.0	7.7	0.0285
Differential blood count		203 (81.5)	6.9	6.7	0.3171
Blood eosinophils		192 (77.1)	8.3	3.5	0.3801
Total IgE		199 (79.9)	5.5	0	0.1274
Specific IgE		197 (79.1)	4.6	0	0.2107
Medical examination of the skin		185 (74.3)	3.2	4.7	0.6981
CT-scan of thorax		183 (73.5)	6.6	4.5	0.7652
mMRC (dyspnea assessment test)		107 (43.0)	50.5	0.7	< 0.0001

AATD = alpha-1 antitrypsin deficiency; CT = computed tomography; DQ = doctor’s questionnaire; IgE = immunoglobulin E

^*Fisher’s exact test

^**could not be calculated for this specific comparison