Table 2.
Characteristics of study subjects in COPD and non-COPD groups
| Responses by items | COPD, n (%) | Non-COPD, n (%) | χ2 | P-value |
|---|---|---|---|---|
| Item-1: age |
404 (0) |
1420 (0) |
119.3 | 0.00 |
|
35–49 y
|
38 (9.4) |
389 (27.4) |
||
|
50–59 y
|
115 (28.4) |
546 (38.4) |
||
|
60–69 y
|
156 (38.6) |
340 (23.9) |
||
|
≥70 y
|
95 (23.5) |
145 (10.2) |
|
|
| Item-2: smoking_amount |
404 (4) |
1420 (6) |
11.08 | 0.00 |
|
x̅ (SD)
|
27.8 (35.7) |
12.0 (21.4) |
||
|
MD (IQR)
|
20.0 (0.0–40.0) |
0.0 (0.0–20.0) |
||
|
Min–Max
|
0.0–365.0 |
0.0–365.0 |
|
|
| Item-3: bio_fuel |
404 (0) |
1420 (0) |
40.56 | 0.00 |
|
No
|
222 (54.9) |
1020 (71.8) |
||
|
Yes
|
182 (45.0) |
400 (28.2) |
|
|
| Item-4: short_breathe |
404 (0) |
1420 (0) |
140.3 | 0.00 |
|
Never
|
91 (22.5) |
627 (44.2) |
||
|
Few times
|
75 (18.6) |
331 (23.3) |
||
|
Sometimes
|
112 (27.7) |
315 (22.2) |
||
|
Often
|
101 (25.0) |
128 (9.0) |
||
|
Always
|
25 (6.2) |
19 (1.3) |
|
|
| Item-5: dyspnoea |
404 (0) |
1420 (0) |
103.1 | 0.00 |
|
No difficulty
|
103 (25.5) |
654 (46.1) |
||
|
Difficult when intense exercise
|
109 (27.0) |
445 (31.3) |
||
|
Difficult when climbing
|
141 (34.9) |
242 (17.0) |
||
|
Difficult when walking
|
48 (11.9) |
75 (5.3) |
||
|
Always difficult
|
3 (0.7) |
4 (0.3) |
|
|
| Item-6: cough |
404 (0) |
1420 (0) |
24.33 | 0.00 |
|
No
|
224 (55.4) |
980 (69.0) |
||
|
Yes
|
180 (44.6) |
442(31.0) |
|
|
| Item-7: cough_up |
404 (0) |
1420 (0) |
49.45 | 0.00 |
|
Never
|
103 (25.5) |
577 (40.6) |
||
|
Sometimes
|
123 (30.4) |
457 (32.2) |
||
|
Every month
|
65 (16.1) |
135 (9.5) |
||
|
Most days
|
44 (10.9) |
90 (6.3) |
||
|
Everyday
|
69 (17.1) |
161 (11.3) |
|
|
| Item-8: childhood_ resp_disease |
404 (0) |
1420 (0) |
0.05 | 0.83 |
|
No
|
387 (95.8) |
1357 (95.6) |
||
|
Yes
|
17 (4.2) |
63 (4.4) |
|
|
| Item-9: relatives_medical_history |
404 (0) |
1420 (0) |
6.93 | 0.01 |
|
No
|
300 (74.3) |
1139 (80.2) |
||
| Yes | 104 (25.7) | 281 (19.8) |