Pearson's correlation coefficients between blood glucose and K
(A), MRGluc (B), and MRGlucMAX (C). The y-axis represents Pearson's correlation value obtained in 112 studies (1,192 observations-see 'Materials and methods' section). The x-axis indicates the 11 tumor models (see Table 1). Open circles represent correlation coefficients of individual studies. Box plots show the 25th, 50th, and 75th percentiles of correlation coefficient distributions for every animal model. The thick brown dashed lines show the median for all data.