Table 1 General characteristics of included studies
First author | Year | Country | Ethnicity | Design | NLR cut-off | SEN | SP | Non-DPN group | DPN group | NOS score | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
N | NLR | N | NLR | |||||||||
Moursy | 2015 | Egypt | Egyptian | Prospective | – | – | – | 27 | 1.74 ± 0.46 | 81 | 2.61 ± 1.60 | 6 |
Liu | 2017 | China | East Asian | Retrospective | 1.7 | 63 | 72 | 233 | – | 278 | – | 8 |
Xu | 2017 | China | East Asian | Prospective | 2.13 | 81 | 48 | 397 | 2.18 ± 0.61 | 160 | 2.58 ± 0.50 | 8 |
Demirdal | 2018 | Turkey | Turkish | Retrospective | – | – | – | 261 | 6.60 ± 5.80 | 19 | 9.80 ± 11.50 | 7 |
Mineoka | 2018 | Japan | East Asian | Prospective | – | – | – | 203 | 1.92 ± 0.76 | 132 | 2.13 ± 0.77 | 8 |
Ranjith | 2018 | India | Indian | Prospective | 2.26 | 88 | 57 | 63 | 1.96 ± 0.60 | 55 | 2.60 ± 0.76 | 6 |
Senyigit | 2018 | Turkey | Turkish | Prospective | – | – | – | 95 | 2.32 ± 1.29 | 30 | 2.49 ± 1.29 | 7 |
Yan | 2019 | China | East Asian | Prospective | – | – | – | 1129 | 3.10 ± 2.58 | 213 | 4.40 ± 4.00 | 8 |
MK | 2020 | India | Indian | Prospective | – | – | – | 86 | 1.91 ± 0.76 | 18 | 2.57 ± 1.90 | 7 |
Raya | 2020 | Egypt | Egyptian | Prospective | 1.84 | 57 | 88 | 30 | 1.92 ± 0.89 | 30 | 2.44 ± 1.11 | 6 |
Wadhwani | 2020 | India | Indian | Prospective | – | – | – | 78 | 1.49 ± 0.54 | 22 | 3.14 ± 1.09 | 7 |
Zhao | 2022 | China | East Asian | Prospective | – | – | – | 79 | 1.76 ± 0.63 | 481 | 2.20 ± 0.94 | 7 |
AbdelAziz | 2021 | Egypt | Egyptian | Prospective | – | – | – | 15 | 1.57 ± 0.84 | 45 | 1.43 ± 0.62 | 6 |
Chen,M | 2021 | China | East Asian | Prospective | 2.48 | 38 | 79 | 81 | 1.80 ± 0.70 | 74 | 2.00 ± 0.84 | 7 |
Chen,Y | 2021 | China | East Asian | Prospective | – | – | – | 90 | 1.93 ± 0.66 | 70 | 2.66 ± 0.68 | 7 |