Prevalence of vitamin D deficiency in Korea: Results from KNHANES 2010 to 2011

The Effect of Vitamin D and Calcium on Cognitive Function and Depression in the Elderly Living in a City

“…It was also lower than the levels reported by Jung [24], which analyzed the results of the KNHANES from 2010 to 2011 and found that the blood level of vitamin D was 20.20 ng/mL in older adults aged 60 to 69, 20.51 ng/mL in those aged 70 to 79, and 20.13 ng/mL in those aged 80 or more [24]. The findings of Kim and Kim [23] differed from the results of this study, which may be explained by the fact that Kim and Kim [23] was conducted only with female elderly people while the subjects of this study included both male and female elderly people as the subjects, taking into account the study results that vitamin D deficiency is more severe in females than in males [23,24]. In addition, it is thought that the subjects of this study had a longer sun exposure time than those of Kim and Kim [23], and it had an effect on the blood level of vitamin D [23].…”

“…In addition, it is thought that the subjects of this study had a longer sun exposure time than those of Kim and Kim [23], and it had an effect on the blood level of vitamin D [23]. The blood level of vitamin D in this study was lower than that of Jung [24]. It is believed to be due to the fact that while the subjects of this study were composed of only the elderly living alone, the subjects of Jung [24] included the elderly living with family members.…”

“…It is believed to be due to the fact that while the subjects of this study were composed of only the elderly living alone, the subjects of Jung [24] included the elderly living with family members. Therefore, it is suggested that the blood level of vitamin should be investigated in both the elderly living with family members and those living alone in the future research [24].…”

The Relationship between Serum Vitamin D Levels, C-Reactive Protein, and Anxiety Symptoms

“…Compared with sufficient vitamin D levels (≥20 ng/mL), insufficient (10)(11)(12)(13)(14)(15)(16)(17)(18)(19).99 ng/mL) and deficient (<10 ng/mL) vitamin D levels were significantly associated with risk of anxiety symptoms. After adjusting for CRP levels, the results were not changed, and no evidence of interaction between vitamin D and CRP levels was found.…”

“…During the study period, the coefficients of variation of the low-level and high-level Quality Control materials were 3.21-5.65% and 2.10-4.03%, respectively. According to the recent clinical guidelines, serum 25(OH) D levels were categorized into three groups: vitamin D deficiency (<10 ng/mL), insufficiency (10)(11)(12)(13)(14)(15)(16)(17)(18)(19).99 ng/mL), and sufficiency (≥20 ng/mL). [16][17][18]…”