Vitamin D levels in schoolchildren: a cross-sectional study in Kuwait

BMC Pediatrics

Table 4 Differences in 25(OH)D between subgroups by their mean ranks

Variable	Catagories	Total (n = 199)		Boys (n = 93)		Girls (n = 106)
Variable	Catagories	Mean rank	p-value	Mean rank	p-value	Mean rank	p-value
Governorate			0.559		0.300		0.953
	Asma	97.13		51.68		50.18
	Hawalli	102.63		53.10		55.38
	Farwania	93.76		35.03		56.80
	Mubarak Al-Kabir	114.30		50.06		57.75
	Ahmedi	90.59		53.72		50.58
	Jahara	98.62		41.91		56.39
Age years			0.016		0.045		0.025
	5.5–6.49	136.65		73.50		67.60
	6.5–7.49	110.39		39.42		71.57
	7.5–8.49	112.98		55.60		52.83
	8.5–9.49	89.25		45.44		42.96
	9.5–10.49	80.57		35.58		48.54
	10.5–11.0	93.92		44.33		46.93
Obesity index			0.084		0.214		0.044
	non	107.85		51.47		59.10
	overweight	91.41		44.02		48.28
	obese	87.42		40.02		39.00
Skin color			0.505		0.936		0.010
	light	105.65		45.34		62.20
	medium	98.51		47.68		50.62
	dark	88.65		47.23		24.33
Sun exposure			0.618		0.465		0.663
	up to 5 min	97.38		49.04		51.40
	up to 15 min	97.34		39.47		58.13
	up to 30 min	106.09		48.03		53.96
Physical activity			0.650		0.170		0.922
	rarely	90.20		39.88		57.41
	weekly	110.85		54.87		54.90
	daily	98.35		44.65		52.26

Bold P-value indicates significant difference in 25(OH)D between subgroups using Kruskall-Wallis H test

ISSN: 1471-2431