What type of study is this?

This is a Systematic Review study (also classified as: Meta-Analysis).

Global prevalence of vitamin D deficiency among patients with knee osteoarthritis: A systematic review and meta-analysis

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Systematic review reveals vitamin D deficiency prevalence of 56.72% in knee osteoarthritis patients, highlighting regional variations.

Over half of knee osteoarthritis patients are vitamin D deficient, with the prevalence reaching 65.92% in Europe.
The analysis included 26 studies, involving 4248 patients, estimating the prevalence using random-effect meta-analysis.
A higher prevalence of vitamin D deficiency was found in obese individuals, with a BMI ≥28 kg/m² at 65.62%.
Targeted screening for vitamin D levels is suggested for knee osteoarthritis patients, considering regional and BMI differences.

Iqhrammullah et al. (2025) studied this question.

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