Table 1.

25-Hydroxyvitamin D Levels in Different Age Groups of Finnish Children, and Differences Between Time Periods of 1998–2002 and 2003–2006 (Means; 95% Confidence Interval)

Age group (y)	Gender (n)	25(OH)D (nmol/L) Years 1998–2002	25(OH)D (nmol/L) Years 2003–2006	Difference (nmol/L)	P Value
0–1.99	Boys (194)	78.0 (74.3–81.6)	88.7 (83.2–94.1)	10.7 (4.8–16.6)	.0006
0–1.99	Girls (120)	74.1 (69.8–78.4)	90.6 (78.7–102.4)	16.5 (4.0–29.0)	.0100
2.0–12.2	Boys (220)	64.6 (61.8–67.4)	80.3 (77.0–83.5)	18.7 (16.0–21.3)	<.0001
2.0–12.2	Girls (136)	60.0 (56.8–63.1)	83.3 (80.6–86.0)	20.3 (17.4–23.2)	<.0001