Vitamin D deficiency among outpatients and hospitalized patients with diabetic foot ulcers: A systematic review and meta-analysis

Table 2 Age, sex, duration of diabetes, and hemoglobin of patients with and without diabetic foot ulcers

Ref.	Study type	Country	Age	Sex	DM duration	HbA1c
Afarideh et al[18], 2016	Cross-sectional, 30, and 30	Iran	Matched	Matched	Matched	Matched
Çağlar et al[19], 2018	Prospective, 58 interventions and 47 controls	Turkey	Controls younger	Matched	Controls newly diagnosed	Matched
Dai et al[20], 2020	Prospective, 21, and 30	China	Matched	Matched	Matched	Matched
Danny Darlington et al[21], 2019	Cross-sectional, 67, and 66	India	Matched	Matched	Matched	Poor glycemic among foot ulcer
Feldkamp et al[22], 2018	Cross-sectional, 104, and 103	Germany	Matched	Matched	Matched	Matched
Gupta et al[23], 2016	Retrospective, 50, and 50	India	Control was younger	Males high among DM	Lon among diabetes	Poor glycemic among foot ulcer
Tang et al[24], 2021	Prospective, 547, and 1174	China	Control was younger	Higher females in control	Lon among diabetes	Matched
Tiwari et al[25], 2014	Cross-sectional, 112 cases, 107 controls	India	Matched	Matched	Matched	Matched
Todorova et al[26], 2020	Cross-sectional, 73, and 169	Bulgaria	Control was younger	Matched	Matched	NA
Tsitsou et al[27], 2021	Cross-sectional, 33, and 35	Greece	Matched	Matched	Matched	Matched
Wang et al[28], 2022	Retrospective, 242, 187	China	Control was younger	Males higher among DM	Lon among diabetes	NA
Xiao et al[29], 2020	Cross-sectional, 245, and 4039	China	Matched	Females more	Matched	Poor glycemic among foot ulcer

DM: Diabetes mellitus; HbA1c: Hemoglobin A1c; NA: Not available.