Study 25(OH)D levels (ng/ml) Weight SMD 95% CI
  PD Control (%)      
  Mean SD Mean SD     Upper limit Lower limit
Sato et al. 12.0 10.8 19.6 3.2 19.94 -0.96 -1.34 -0.59
Sato et al. 11.9 6.5 33.3 3.1 19.77 -3.98 -4.42 -3.55
Evattet al. 31.9 13.6 37.0 14.5 20.14 -0.36 -0.64 -0.08
Abou-Raya et al. 12.9 9.9 21.6 4.8 20.01 -1.09 -1.43 -0.74
Knekt et al. 14.5 7.4 16.7 7.8 20.14 -0.28 -0.56  -0.00
Table 2: Results from statistical tests that were performed for a meta-analysis comparing 25(OH)D serum levels (ng/ml) between individuals with Parkinson’s disease, and healthy control individuals.
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