Table 1.
Characteristics of included studies
| Authors | Location, year | DR | T2DM without DR | Control | -Tubes | NOS | |||
|---|---|---|---|---|---|---|---|---|---|
| N | MPV | N | MPV | N | MPV | ||||
| Yilmaz et al. | Turkey, 2016 | 174 | 8.1 ± 0.83 | 88 | 7.81 ± 0.76 | 85 | 7.42 ± 0.68 | EDTA | 9 |
| Ateş et al. | Turkey, 2009 | 90 | 7.96 ± 0.76 | 30 | 7.52 ± 1.01 | EDTA | 9 | ||
| Dindar et al. | Turkey, 2013 | 24 | 11.26 ± 1.08 | 47 | 10.68 ± 1.68 | 50 | 10.23 ± 1.01 | EDTA | 9 |
| Citirik et al. | Turkey, 2015 | 97 | 8.08 ± 0.71 | 43 | 7.94 ± 0.63 | 40 | 7.74 ± 0.78 | EDTA | 8 |
| Demirtas et al. | Turkey, 2015 | 67 | 9.54 ± 0.88 | 240 | 9.2 ± 0.92 | NR | 8 | ||
| Tetikoglu et al. | Turkey, 2016 | 136 | 8.71 ± 0.82 | 63 | 8.51 ± 1 | 76 | 8.32 ± 0.9 | NR | 7 |
| Müberra et al. | Turkey, 2016 | 120 | 9.6 ± 1 | 158 | 9.7 ± 1.2 | 107 | 9.3 ± 1 | EDTA | 8 |
| Gungor et al. | Turkey, 2016 | 52 | 9.3 ± 1 | 50 | 8.8 ± 1.1 | 50 | 8.3 ± 0.6 | EDTA | 9 |
| Zhong et al. | China, 2011 | 200 | 10.09 ± 0.92 | 100 | 9.46 ± 0.93 | NR | 7 | ||
| Li et al. | China, 2016 | 47 | 10.72 ± 1.57 | 52 | 10.39 ± 0.9 | 48 | 9.75 ± 0.89 | EDTA | 8 |
| Zhou et al. | China, 2016 | 51 | 10.4 ± 1.1 | 328 | 10 ± 1.1 | 96 | 9.1 ± 0.8 | NR | 8 |
| Radha et al. | India, 2016 | 14 | 9.2 ± 0.61 | 30 | 8.39 ± 0.68 | 100 | 8.02 ± 0.86 | EDTA | 8 |
| Buch et al. | India, 2017 | 80 | 11.4 ± 1.96 | 162 | 9.91 ± 1.97 | 200 | 8.48 ± 1.01 | EDTA | 6 |
| Papanas et al. | Greece, 2004 | 167 | 15.8 ± 1.3 | 98 | 10.9 ± 1.1 | 151 | 7.1 ± 1.2 | Citrate | 6 |
DR diabetic retinopathy, T2DM without DR type 2 diabetic mellitus without DR, N number of subjects, MPV mean platelet volume, NOS Newcastle–Ottawa scale, EDTA ethylenediaminetetraacetic acid, NR no report