Degree of agreement between the fixed ratio and LLN for airflow obstruction for an entire cohort and across age deciles
| Overall (n=7743) | 45–50 (n=1303) | 51–60 (n=2806) | 61–80 (n=3638) | |
|---|---|---|---|---|
| Smokers (Fixed−LLN−) | 4491 | 1055 | 1929 | 1519 |
| COPD (Fixed+LLN+) | 2686 | 210 | 759 | 1712 |
| Fixed+LLN− | 548 | 22 | 116 | 407 |
| LLN+Fixed− | 18 | 16 | 2 | 0 |
| κ (95% CI) | 0.85 (0.83 to 0.86) | 0.90 (0.87 to 0.93) | 0.90 (0.88 to 0.92) | 0.78 (0.76 to 0.80) |
LLN, lower limit of normal.