Higher vitamin D serum concentration increases health related quality of life in patients with inflammatory bowel diseases

Table 3 Mean short inflammatory bowel diseases questionnaire scores of Crohn's disease and ulcerative colitis patients in the summer/autumn and the winter/spring period according to their vitamin D serum concentrations

VD concentration (ng/mL)	sIBDQ (mean ± SE)
	CD			UC
	Summer/autumn (n= 107)	Winter/spring (n= 87)	All measurements (n= 194)	Summe/autumn (n= 72)	Winter/spring (n= 44)	All measurements (n= 116)
< 10	56.6 ± 3.0	55.8 ± 2.2	56.1 ± 1.7	281	44.5 ± 3.5	42.1 ± 3.8a
10-19.9	58.6 ± 2.3	56.0 ± 2.6	57.3 ± 1.7	54.3 ± 2.4	49.0 ± 3.4	51.7 ± 2.1
20-29.9	58.2 ± 1.7	56.1 ± 1.8	57.0 ± 1.2	56.9 ± 2.9	48.3 ± 4.2	53.0 ± 2.5
30-30.9	58.4 ± 1.7	61.8 ± 2.3	59.6 ± 1.4	56.3 ± 2.5	53.3 ± 5.1	55.1 ± 2.5
40-40.9	56.0 ± 3.0	59.0 ± 6.1	56.8 ± 2.7	58.0 ± 2.2	60.3 ± 3.5	58.9 ± 1.9
50-50.9	66.7 ± 1.7	60.0 ± 3.2	62.9 ± 2.3	63.0 ± 5.0	70	65.3 ± 3.7c
> 60	53.7 ± 6.2	NA	53.7 ± 6.2	451	NA	451

^aP < 0.05 vs all other bins except > 60 ng/mL;

^cP < 0.05 vs the < 10 ng/mL and 10-19.9 ng/mL bins;

¹Too few cases to calculate the mean value. NA: Not available; VD: Vitamin D; IBD: Inflammatory bowel diseases; CD: Crohn‘s disease; UC: Ulcerative colitis; sIBDQ: Short inflammatory bowel diseases questionnaire.