Study Number of 25(OH)D levels (ng/ml) Country Mean age Gender (% female)   people  PD Control   (years)    PD Control Mean SD Mean SD   PD Control PD Control Sato et al. 60 62 12.0 10.8 19.6 3.2 Japan 71.6 72.4 100.0 100.0 Sato et al. 142 99 11.9 6.5 33.3 3.1 Japan 69.9 68.8 54.9 57.6 Evattet al. 100 99 31.9 13.6 37.0 14.5 America 65.4 65.7 43.0 43.0 Abou-Raya et al. 82 68 12.9 9.9 21.6 4.8 Egypt 67.5 67.0 47.6 47.1 Knektet al. 50 3123 14.5 7.4 16.7 7.8 Finland 60.4 61.8 52.8 56.9

Table 1: Data extracted from five studies comparing the 25(OH)D serum level (ng/ml) between individuals with Parkinson’s disease and healthy control individuals.

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