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. 2020 Dec 23;206(3):515–523. doi: 10.4049/jimmunol.2000964

FIGURE 1.

FIGURE 1.

Serum 25(OH)D levels in patients with COPD and control subjects. Serum 25(OH)D was measured by RIA. (A) Serum 25(OH)D level was compared between COPD patients and control subjects (n = 101 for COPD patients; n = 202 for control subjects). (B) Serum 25(OH)D level was compared among patients with different grades of COPD (n = 28 for grade 1–2 of COPD patients; n = 29 for grade 3 of COPD patients; n = 44 for grade 4 of COPD patients). All data were expressed as means ± SEM. *p < 0.05, **p < 0.01.