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MEAN FEV1 PERCENT PREDICTED, STRATIFIED BY BASELINE PLASMA 25(OH)D LEVEL IN THE COPD CLINICAL RESEARCH NETWORK AZITHROMYCIN TRIAL
| 25(OH)D Level (ng/ml) | n | Mean FEV1% Predicted (95% Confidence Interval) |
| 0–9.99 | 82 | 38.4 (34.9–42.0) |
| 10–19.99 | 229 | 37.9 (35.8–39.8) |
| 20–29.99 | 322 | 39.9 (38.2–41.6) |
| 30–39.99 | 233 | 41.0 (39.0–43.1) |
| ≥40 | 107 | 40.6 (37.6–43.5) |
Definition of abbreviations: COPD = chronic obstructive pulmonary disease; 25(OH)D = 25-hydroxyvitamin D.
