Table 2.
Estimated Population Prevalence of COPD Shown as Number (%) According to Different Definitions in the Canadian Obstructive Lung Disease (COLD) Cohort
| All Sites | Vancouver | Calgary | Saskatoon | Toronto | Kingston | Ottawa | Montreal | Quebec City | Halifax | |
|---|---|---|---|---|---|---|---|---|---|---|
| Men | ||||||||||
| N | 2096 | 344 | 209 | 226 | 221 | 229 | 226 | 223 | 258 | 160 |
| Airflow obstruction (LLN ratio) | 241(10.9) | 44(14.5) | 23(10.3) | 31(11.5) | 18(7.9) | 36(14.4) | 19(7.2) | 34(16.0) | 19(6.6) | 17(8.6) |
| Airflow obstruction (fixed ratio < 70%) | 428(18.3) | 68(22.0) | 46(19.3) | 61(21.4) | 41(16.8) | 63(23.9) | 37(12.9) | 47(21.9) | 35(12.3) | 30(15.0) |
| GOLD 1 | 248(10.1) | 40(12.7) | 22(9.5) | 38(13.8) | 25(9.6) | 45(16.6) | 21(7.0) | 23(11.7) | 18(6.7) | 16(7.7) |
| GOLD 2 | 157(6.7) | 28(9.3) | 22(9.1) | 20(6.7) | 14(6.1) | 17(7.0) | 14(5.5) | 20(7.9) | 13(4.3) | 9(5.0) |
| GOLD 3–4 | 23(1.4) | 0(0.0) | 2(0.7) | 3(0.9) | 2(1.0) | 1(0.3) | 2(0.5) | 4(2.4) | 4(1.3) | 5(2.3) |
| Women | ||||||||||
| N | 2797 | 483 | 360 | 232 | 300 | 277 | 230 | 318 | 299 | 298 |
| Airflow obstruction (LLN ratio) | 316(11.4) | 58(12.5) | 42(10.8) | 26(9.8) | 29(10.1) | 41(13.4) | 24(10.6) | 42(13.6) | 26(9.6) | 28(9.8) |
| Airflow obstruction (fixed ratio < 70%) | 413(14.4) | 77(16.8) | 58(14.7) | 43(16.1) | 37(12.9) | 50(16.4) | 32(13.4) | 53(16.7) | 30(11.2) | 33(11.0) |
| GOLD 1 | 219(7.4) | 45(9.6) | 29(7.4) | 24(9.6) | 16(5.5) | 34(11.3) | 19(8.3) | 28(9.7) | 10(4.2) | 14(4.4) |
| GOLD 2 | 159(5.9) | 24(5.5) | 25(6.1) | 17(6.0) | 17(6.4) | 13(4.3) | 13(5.1) | 21(6.0) | 15(5.4) | 14(4.6) |
| GOLD 3–4 | 35(1.0) | 8(1.8) | 4(1.1) | 2(0.6) | 4(1.1) | 3(0.8) | 0(0.0) | 4(1.0) | 5(1.6) | 5(2.0) |
| Overall | ||||||||||
| N | 4893 | 827 | 569 | 458 | 521 | 506 | 456 | 541 | 557 | 458 |
| Airflow obstruction (LLN ratio) | 557(11.2) | 102(13.4) | 65(10.6) | 57(10.6) | 47(9.1) | 77(13.9) | 43(9.0) | 76(14.7) | 45(8.3) | 45(9.3) |
| Airflow obstruction (fixed ratio < 70%) | 841(16.2) | 145(19.3) | 104(16.9) | 104(18.5) | 78(14.7) | 113(19.9) | 69(13.2) | 100(19.0) | 65(11.7) | 63(12.9) |
| GOLD 1 | 467(8.6) | 85(11.1) | 51(8.4) | 62(11.5) | 41(7.4) | 79(13.7) | 40(7.7) | 51(10.6) | 28(5.3) | 30(5.9) |
| GOLD 2 | 316(6.4) | 52(7.3) | 47(7.5) | 37(6.3) | 31(6.3) | 30(5.6) | 27(5.3) | 41(6.8) | 28(4.9) | 23(4.8) |
| GOLD 3–4 | 58(1.2) | 8(0.9) | 6(0.9) | 5(0.7) | 6(1.0) | 4(0.6) | 2(0.2) | 8(1.6) | 9(1.4) | 10(2.2) |
Notes: Data are shown as n and % indicating number and population prevalence, respectively. Site-specific prevalence estimates are weighted to the local site population, sex and age profiles obtained from the Canadian population census 2006. GOLD Grades are defined as GOLD 1 = FEV1/FVC<0.7 and FEV1% predicted ≥80%; GOLD 2 = FEV1/FVC<0.7 and FEV1% predicted <80% ≥50%; GOLD 3–4 = FEV1/FVC<0.7 and FEV1% predicted <50%.