Table 1.

Mean seasonally adjusted serum 25(OH)D₃ ng/mL levels drawn from groups of U.S. Marines.

Deployed	Age	Mean	SD	n	95% CI LL	95% CI UL	p
Other	20–31	28.62	11.73	16	23.96	33.40	0.801
	32–56	27.57	10.52	14	21.58	32.56
	Total	28.13	11.00	30	24.68	31.52
Wz	20–31	22.84	8.42	31	19.48	26.19	0.008
	32–56	28.25	8.80	44	25.43	31.07
	Total	26.01	9.00	75	23.35	27.74
Total	20–31	24.81	9.94	47	22.86	28.61
	32–56	28.08	9.15	58	25.04	30.78
				105

Other = Marines deployed to locations other than a war zone were not found to have age-related difference in serum levels, F = 0.65, p = 0.801. Wz = Marines deployed to the war zones of Iraq or Afghanistan were found to have an age-related difference in serum levels, F = 7.42, p = 0.008.