4.6 Article

Serum vitamin C status of people in New South Wales: retrospective analysis of findings at a public referral hospital

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MEDICAL JOURNAL OF AUSTRALIA
卷 -, 期 -, 页码 -

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WILEY
DOI: 10.5694/mja2.52132

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Vitamin C; Socioeconomic factors

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This study examined the relationship between vitamin C status and demographic factors in New South Wales. The results showed that vitamin C deficiency was more prevalent among older people and those living in areas of socio-economic disadvantage. It suggests that population assessment of vitamin C levels would be appropriate.
Objectives: To examine the relationship between vitamin C status and demographic factors in New South Wales on the basis of serum vitamin C test results undertaken at the central pathology laboratory in Sydney, and to assess associations with age, gender, social disadvantage, and geographic remoteness.Design, setting: Retrospective observational study; analysis of vitamin C test results undertaken at the Royal Prince Alfred Hospital, 1 January 2017 - 31 December 2021.Main outcome measures: Vitamin C status (normal, serum concentration >= 40 mu mol/L; hypovitaminosis C, 12-39 mu mol/L; significant deficiency, < 12 mu mol/L); associations of vitamin C status with year of testing, age, gender, socio-economic status (Index of Relative Socio-Economic Advantage and Disadvantage quintile), and geographic remoteness (Australian Statistical Geography Standard); rate of hypovitaminosis C or significant deficiency test results (relative to findings of normal levels; per 100 000 estimated resident population) by Statistical Area 3.Results: Of 17 507 vitamin C tests undertaken during 2017-2021, 4573 were excluded (multiple tests for individuals); of 12 934 included results, 6654 were for women (51.5%), 9402 for people living in major cities (73.5%), and 81 for people in remote or very remote areas (0.6%). In multivariable multinomial regression analyses, significant deficiency (relative to normal test results) was more likely for men than women (adjusted odds ratio [aOR], 1.39; 95% confidence interval [CI], 1.27-1.52); the likelihood of hypovitaminosis C (IRSAD quintile 1 v 5, aOR, 1.35; 95% CI, 1.19-1.53) or significant deficiency (aOR, 2.07; 95% CI, 1.79-2.40) generally increased with postcode-level socio-economic disadvantage. Several of the population areas with the highest low vitamin C rates were areas of greatest disadvantage in NSW.Conclusions: The prevalence of vitamin C deficiency among older people and people living in areas of socio-economic disadvantage indicates that population assessment of vitamin C levels would be appropriate.

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