Table 11.

25OHD levels in relation to quarter of the year (GCT main group)

		25OHD serum levels (ng/ml)
categories	n	Median (Q1;Q3)	Mean (SD)	p-valuea
Jan - Mar	58	11.80 (8.60, 16.90)	14.34 (8.23)
Apr - Jun	34	17.90 (11.60, 24.30)	18.56 (9.05)
Jul - Sep	37	23.50 (15.60, 31.10)	25.84 (14.93)
Oct - Dec	36	15.50 (10.70, 23.80)	22.79 (24.87)
				<.0001

Q1 first quartile, Q3 third quartile, SD standard deviation

^aKruskal Wallis test