Table 2. Mean (ng/mL) and Standard Deviation of 25(OH)D Serum Concentrations by Seasons, Site and Race, 1996-2008 (n= 2,583).
| Non-Hispanic Black (n=649), Mean(Standard Deviation) | Non-Hispanic White (n=1934), Mean(standard deviation) | |||||||
|---|---|---|---|---|---|---|---|---|
|
|
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| OMEGA, Seattle (n=27) | PIN, North Carolina (n=350) | POUCH, Michigan (n=272) | Total (n=649) | OMEGA, Seattle (n=727) | PIN, North Carolina (n=642) | POUCH, Michigan (n=565) | Total (n=1934) | |
| Winter (Dec to Feb) | 24.6(6.9) | 17.5(8.6) | 17.7(9.2) | 18.1(8.9) | 29.7(8.4) | 29.4(9.9) | 34.6(10.9) | 31.2(10.1) |
| Spring (Mar to May) | 27.6(6.7) | 18.0(8.8) | 18.5(8.2) | 18.7(8.7) | 29.4(8.9) | 30.8(9.4) | 33.5(10.3) | 31.0(9.7) |
| Summer (Jun to Aug) | 36.5(4.5) | 21.6(8.5) | 24.8(10.4) | 23.6(9.8) | 33.4(8.6) | 35.0(10.8) | 39.3(9.5) | 35.9(9.9) |
| Fall (Sep to Nov) | 22.5(6.6) | 19.4(9.8) | 22.5(8.9) | 20.7(9.5) | 31.9(7.7) | 33.0(8.8) | 36.7(10.6) | 33.5(9.2) |
| Annual | 26.8(7.3) | 19.0(9.0) | 20.9(9.6) | 20.2(9.4) | 31.2(8.6) | 31.9(9.9) | 36.1(10.5) | 32.8(9.9) |