Review Article
Meta-Analysis of Visual Evoked Potential and Parkinson’s Disease
Table 2
Metaregression analysis and subgroup analysis.
| Subgroup factor | Assign criteria | Number of studies | WMD (95% CI) | -difference between groups |
| Sample size | ≤20 | 10 | 4.20 (1.38, 7.02) | 0.001 | >20 | 10 | 7.64 (2.21, 13.1) |
| Publication year | Before 2000 | 10 | 6.25 (1.91, 10.6) | 0.12 | 2000 or later | 10 | 5.79 (0.49, 11.1) |
| Age (years) | <64 | 9 | 9.39 (3.04, 15.7) | 0.08 | ≥64 | 11 | 3.38 (1.18, 5.58) |
| Proportion of men | >50% | 8 | 4.47 (2.03, 6.91) | 0.03 | ≤50% | 4 | 8.44 (−3.98, 20.9) |
| Duration (months) | ≤56.4 | 8 | 4.82 (−2.31, 12.0) | 0.01 | >56.4 | 7 | 6.38 (1.08, 11.6) |
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Adjusted for all factors in this table. |