|
|
Table 1.
Bronchial obstruction in smokers with forced
expiratory volume in one second (FEV1) <80% of predicted
within different groups of
symptoms
|
|
Symptom
|
No of patients reporting
symptom
|
No (%, 95% CI) of patients with FEV1
<80%
|
Odds ratio* (95% CI)
|
Negative
predictive value (%)
|
| Family
history: |
|
|
|
|
| Asthma |
33 |
6 (18, 7 to 35) |
1.03
(0.38 to 2.77) |
82 |
| Allergy |
28 |
6 (21, 8 to 41) |
1.35
(0.49 to 3.70) |
83 |
| Symptom: |
|
|
|
|
| Tiredness |
90 |
19 (21, 13 to
31) |
1.77 (0.77 to 4.06) |
87 |
| Chronic wheeze |
44 |
12 (27, 15 to 43) |
2.15 (0.94 to 4.88) |
85 |
| Chronic
dyspnoea |
79 |
19 (24, 15 to 35) |
2.19 (0.98 to 4.90) |
87 |
| Chronic cough |
64 |
17 (27, 16 to 39) |
2.50 (1.14 to
5.52) |
87 |
| No of symptoms: |
|
|
|
|
| 1 |
105 |
23
(22, 14 to 31) |
2.28 (0.93 to 5.60) |
89 |
| 2 |
59 |
17 (29, 18 to 42) |
3.02 (1.37 to 6.64) |
88 |
| 3 |
23 |
8 (35, 16 to
57) |
3.01 (1.17 to 7.70) |
85 |
|
|
*
Estimates of common odds ratio by Mantel-Haenszel test.
|
|