Association between anemia and the risk of diabetic foot ulcer: A meta-analysis

Table 2 Study quality evaluation via the Newcastle-Ottawa scale

Ref.	Adequate definition of cases	Representativeness of cases	Selection of controls	Definition of controls	Control for age	Control for other confounders	Exposure ascertainment	Same methods for events ascertainment	Non-response rates	Total
Hokkam et al[16], 2009	0	1	1	1	1	1	0	1	1	7
Khanbhai et al[17], 2012	1	0	1	1	0	0	1	1	1	6
Jiang et al[18], 2015	1	0	1	1	1	1	1	1	1	8
Alsayegh et al[19], 2017	1	1	1	1	0	0	1	1	1	7
Shareef et al[20], 2019	0	1	1	1	1	1	1	1	1	8
Shi et al[21], 2021	1	1	1	1	0	0	1	1	1	7
Jiang et al[22], 2022	1	0	1	1	1	1	1	1	1	8
Ardelean et al[24], 2023	0	1	1	1	1	1	1	1	1	8
Li et al[25], 2023	0	1	1	1	0	0	1	1	1	6
Li et al[26], 2023	1	0	1	1	1	1	1	1	1	8
Afrid et al[23], 2023	1	0	1	1	0	0	1	1	1	6
Rupasinghe et al[30], 2024	1	0	1	1	0	0	1	1	1	6
Zaki et al[31], 2024	1	0	1	1	0	0	1	1	1	6
Fan et al[28], 2024	0	0	1	1	1	1	0	1	1	6
Cao et al[27], 2024	1	0	1	1	1	1	1	1	1	8
Jiang et al[29], 2024	1	0	1	1	1	1	1	1	1	8