. 2017 Feb 17;9(2):e1038. doi: 10.7759/cureus.1038

Table 1. Comparison and Findings of the Studies.

25(OH)D: 25-hydroxyvitamin D; HTN: hypertension

Author	Year of Publication	N	Mean Age (Years)	Mean 25(OH)D (ng/ml)	Mean Systolic Blood Pressure (mm/Hg)	Mean Diastolic Blood Pressure (mm/Hg)	Findings
Kota, et al. [26]	2011	50	49.5 ± 7.8	18.5 ± 6.4	162.4 ± 20.2	100.2 ± 11.2	Lower 25(OH)D levels associated with increased blood pressure
Ullah, et al. [27]	2010	-	-	-	-	-	Larger 25(OH)D levels associated with lower blood pressure
Kunutsor, et al. [28]	2013	-	-	-	-	-	Larger 25(OH)D levels associated with lower chances to develop HTN
Witham, et al. [29]	2009	-	-	-	-	-	Larger 25(OH)D levels associated with lower chances to develop HTN
Jorde, et al. [30]	2010	4,125	-	-	-	-	No association between 25(OH)D and HTN
Forman, et al. [31]	2007	117,730	-	-	-	-	Larger 25(OH)D levels associated with lower chances to develop HTN
Larsen, et al. [32]	2012	112	61 ± 10	23 ± 10	Decreased by 7 mmHg after taking Vitamin D supplementation in 24 hrs vs. placebo	Decreased by 2 mmHg after taking Vitamin D supplementation vs. placebo	Vitamin D supplementation in patients with low levels of 25(OH)D brings down blood pressure
Carrara, et al. [33]	2013	15	43.6 ± 21.6	18.3 ± 2.8	At 0 week: 137.4 ± 1.8	At 0 week: 81.6 ± 1.8	Vitamin D supplementation in patients with low levels of 25(OH)D brings down blood pressure
Carrara, et al. [33]	2013	15	43.6 ± 21.6	18.3 ± 2.8	At 8 weeks (after Vitamin D supplementation): 134.8 ± 2.3	At 8 weeks: 81.0 ± 1.6
Vimaleswaran, et al. [34]	2014	146,581	-	-	-	-	Larger 25(OH)D levels associated with lower blood pressure
Caro, et al. [36]	2012	219	41.5 ± 13.9	29.2 ± 10.6	113.2 ± 13.1	73.3 ± 9.7	No association between 25(OH)D and HTN
Margolis, et al. [37]	2008	36,282	62 ± 7	-	-	-	No association between 25(OH)D and HTN
Li, et al. [38]	2012	1,420	-	-	-	-	No association between 25(OH)D and HTN
Kashi, et al. [39]	2004	251	50 ± 8	-	-	-	No association between 25(OH)D and HTN