Comparison of Vitamin D levels in individuals with and without periodontitis
PERIODONTITIS
As shown in Fig. Forest plot of studies evaluating serum 25(OH)D/vitamin D levels in individuals with and without periodontitis. As shown in Fig. Forest plot of studies evaluating saliva 25(OH)D levels in individuals with and without periodontitis. SMD: standardized mean difference; a: case–control studyDue to the large heterogeneity among the studies, sensitivity analysis was conducted by eliminating study one by one. And the results of sensitivity analysis showed that excluding any study did not change the direction of the outcome, which indicated that the study was relatively stable (Supplementary Material Figure S1).