From: Association of body mass index and COPD exacerbation among patients with chronic bronchitis
 | Total (N = 1264) | Non-CB | CB | P | ||
---|---|---|---|---|---|---|
BMI ≥ 25 (n = 230) | BMI < 25 (n = 583) | BMI ≥ 25 (n = 98) | BMI < 25 (n = 353) | |||
Age, years | 69.1 ± 7.8 | 68.9 ± 7.4 | 69.9 ± 7.7 | 67.5 ± 7.9 | 68.3 ± 8.0 | 0.003 |
Sex, male | 1150 (91.0) | 200 (87.0) | 536 (91.9) | 89 (90.8) | 325 (92.1) | 0.095 |
Smoking status (N = 1260) | 0.002 | |||||
 Current smoker | 327 (26.0) | 48 (20.9) | 133 (23.0) | 27 (27.6) | 119 (33.7) |  |
 Ex-smoker | 818 (64.9) | 153 (66.5) | 391 (67.5) | 63 (64.3) | 211 (59.8) |  |
 Never smoker | 115 (9.1) | 29 (12.6) | 55 (9.5) | 8 (8.2) | 23 (6.5) |  |
Education (N = 1260) | 0.118 | |||||
 Middle school or less | 727 (57.7) | 122 (53.0) | 327 (56.4) | 58 (59.2) | 220 (62.5) |  |
 High school or more | 533 (42.3) | 108 (47.0) | 253 (43.6) | 40 (40.8) | 132 (37.5) |  |
Area of residence (N = 1223) | 0.555 | |||||
 Urban area | 481 (39.3) | 144 (63.4) | 338 (60.4) | 51 (54.8) | 209 (60.9) |  |
 Rural area | 742 (60.7) | 83 (36.6) | 222 (39.6) | 42 (45.2) | 134 (39.1) |  |
CAT score (N = 1253) | 15.2 ± 7.8 | 12.8 ± 6.80 | 13.3 ± 7.05 | 16.6 ± 7.34 | 19.4 ± 8.07 | < 0.0001 |
 CAT score ≥ 10 | 931 (74.3) | 151 (65.9) | 387 (67.2) | 81 (83.5) | 312 (88.9) | < 0.0001 |
mMRC grade  (N = 1263) | 1.43 ± 0.90 | 1.26 ± 084 | 1.37 ± 0.91 | 1.43 ± 0.86 | 1.65 ± 0.90 | < 0.0001 |
 mMRC grade ≥ 2 | 495 (39.2) | 72 (31.3) | 209 (35.8) | 40 (40.8) | 174 (49.4) | < 0.0001 |
SGRQ-CÂ (N = 1259) | Â | |||||
 Symptom | 44.6 ± 20.6 | 36.2 ± 16.0 | 37.2 ± 17.6 | 55.4 ± 19.5 | 59.4 ± 18.7 | < 0.0001 |
 Activity | 46.1 ± 23.6 | 40.7 ± 21.0 | 44.0 ± 23.3 | 46.7 ± 22.5 | 53.1 ± 24.5 | < 0.0001 |
 Impact | 24.4 ± 19.6 | 18.6 ± 16.4 | 20.5 ± 17.1 | 29.3 ± 20.2 | 33.3 ± 21.7 | < 0.0001 |
 Total | 34.3 ± 18.9 | 28.1 ± 15.7 | 30.3 ± 17.2 | 38.8 ± 18.6 | 43.6 ± 20.0 | < 0.0001 |
Exacerbation in the previous year (N = 1253)a | 309 (24.7) | 41 (17.9) | 137 (23.7) | 21 (21.6) | 110 (31.4) | 0.002 |
History of asthma (N = 1253) | 473 (37.7) | 86 (37.4) | 224 (39.0) | 32 (33.0) | 131 (37.3) | 0.722 |
Charlson comorbidity index (CCI) | 2.13 ± 1.49 | 2.35 ± 1.42 | 2.16 ± 1.61 | 2.08 ± 1.28 | 1.94 ± 1.34 | 0.010 |
 CCI ≥ 3 | 363 (28.7) | 89 (38.7) | 162 (27.8) | 26 (26.5) | 86 (24.4) | 0.002 |