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Table 5 Pre-PFT questionnaires of BDTs

From: Clinical analysis of the “small plateau” sign on the flow-volume curve followed by deep learning automated recognition

Parameter BDT (+) BDT (−)
SP sign (+)
(N = 12)
SP sign (−)
(N = 2235)
P value SP sign (+)
(N = 119)
SP sign (−)
(N = 3728)
P value
Smoking status, n (%)    .111    .005
 Current or former smoker 3 (25%) 1083 (48%)   45 (38%) 1929 (52%)  
 Never smoker 9 (75%) 1172 (52%)   74 (62%) 1799 (48%)  
Chronic cough, n (%)    .338    .270
 Rare 2 (17%) 625 (28%)   27 (23%) 1016 (27%)  
 Sometimes 10 (83%) 1610 (72%)   92 (77%) 2712 (73%)  
Sputum production, n (%) 9/12
(75%)
1559/2235
(70%)
1.000 75/119
(63%)
2651/3728
(71%)
.056
Wheezing, n (%) 11/12
(92%)
1234/2235
(55%)
.011 68/119
(57%)
1703/3728
(46%)
.014
PFT indication, n (%)       
 Cough 2/12
(17%)
262/2235
(12%)
.643 8/119
(7%)
328/3728
(9%)
.430
 COPD 0/12
(0%)
809/2235
(34%)
.006 33/119
(28%)
1696/3728
(45%)
< .0001
 Asthma 10/12
(83%)
905/2235
(40%)
.002 38/119
(32%)
720/3728
(19%)
< .0001
 Bronchiectasis 0/12
(0%)
54/2235
(2%)
1.000 11/119
(9%)
293/3728
(8%)
.582
 ILD 0/12
(0%)
12/2235
(1%)
1.000 3/119
(3%)
70/3728
(2%)
.493
 Rhinitis/sinusitis 3/12
(25%)
18/2235
(1%)
< .0001 21/119
(18%)
39/3728
(1%)
< .0001
 Gastroesophageal reflux 0/12
(0%)
1/2235
(0%)
1.000 3/119
(3%)
0/3728
(0%)
< .0001
 Pneumonia 3/12
(25%)
56/2235
(3%)
.003 16/119
(13%)
210/3728
(6%)
< .0001
 Shortness of breath 1/12
(8%)
114/2235
(5%)
.468 5/119
(4%)
176/3728
(5%)
.792
 Chest distress 0/12
(0%)
9/2235
(0%)
1.000 2/119
(2%)
25/3728
(1%)
.203
 Othersa 0/12
(0%)
48/2235
(2%)
1.000 5/119
(4%)
171/3728
(5%)
.843
  1. Data are presented as absolute numbers in the case of frequencies. P values < .05 were considered to represent a significant difference in prevalence between SP signs of the negative and positive BDT categories
  2. COPD, chronic obstructive pulmonary disease; ILD, interstitial lung disease
  3. aIndications include hypertension, coronary heart disease, diabetes, eosinophilic granulomatosis with polyangiitis, and studies without documented indication