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. Author manuscript; available in PMC: 2016 Mar 4.
Published in final edited form as: Respir Med. 2010 Jan 13;104(4):564–570. doi: 10.1016/j.rmed.2009.12.004

Figure 1.

Figure 1

1, 25-dihydroxyvitamin D levels determined by quartiles based on the 25th percentile, median, and 75th percentile. Test for trend, p-value = 0.019. † Chi-square test of significance with reference level ≤ 33 pg/ml.