Table 2.
Characteristics of patient cohorts with three or more outpatient or two or more inpatient ICD9-CM COPD codes
| COPD
|
Indeterminate/not COPD
|
P-value | |
|---|---|---|---|
| n=6,125 | n=2,360 | ||
|
|
|
|
|
| Age, years | 71.4±11.4 | 67.1±12.5 | <0.001 |
| ≥65 | 4,400 (71.8) | 1,308 (55.4) | <0.001 |
| Male gender | 4,774 (77.9) | 1,569 (66.5) | <0.001 |
| Smoking status | |||
| Smoker/ex-smoker | 4,742 (77.4) | 1,372 (58.1) | <0.001 |
| Never smoker | 734 (12.0) | 542 (23.0) | |
| Unknown | 649 (10.6) | 446 (18.9) | |
| CCI score, excluding | 0.98±1.55 | 0.77±1.33 | <0.001 |
| COPD | |||
| 0 | 3,386 (55.3) | 1,442 (61.1) | <0.001 |
| ≥1 | 2,739 (44.7) | 918 (38.9) | |
| Comorbidities | |||
| Hypertension | 2,197 (35.9) | 881 (37.3) | 0.210 |
| Coronary artery disease | 1,152 (18.8) | 415 (17.6) | 0.193 |
| Diabetes mellitus | 904 (14.8) | 367 (15.6) | 0.360 |
| Heart failure | 665 (10.9) | 180 (7.6) | <0.001 |
| Cerebrovascular disease | 589 (9.6) | 205 (8.7) | 0.188 |
| Spirometry performed | 4,970 (81.1) | 1,095 (46.4) | <0.001 |
Abbreviation: CCI, Charlson Comorbidity Index.