Characteristics of studies included in the salivary glucose means and correlation meta-analysis.

DM: diabetes mellitus; GOD-POD: glucose oxidase-peroxidase method for glucose estimation; GOD-PAP: glucose oxidase/phenol +aminophenazone. *These data were not included in the meta-analysis;**this sets of data were combined (merged) before inclusion in the meta-analysis as a subgroup of studies;£not included in meta-analysis, since salivary glucose/glycemia correlation global values for type 2 DM (for both controlled and uncontrolled subjects and for both studies) and controls (for both studies) were not available on the article, and the author failed to provide that information after request;Δnot included in meta-analysis, since no correlation and significance values on salivary glucose and/or glycemia correlation were posted on the article, and the author failed to provide that information after request;§not included in meta-analysis, since no standard deviation data were present on salivary glucose mean results on the article, and the author failed to provide that information after request;¥The correlation coefficient were obtained from 3 days of measurements on six individuals.