Figure 1.
Flowchart of the study selection process.
Figure 2.
Methodological quality of the 28 studies.
Table 1.
Characteristics of the included studies.
Figure 3.
Forest plots of the summary correlation coefficient (r) with corresponding 95% CIs for the correlation between the ADC value and tumor cellularity in patients from all eligible studies.
Figure 4.
Forest plots of the pooled r with corresponding 95% CIs after two studies were excluded following a sensitivity analysis and forest plots of the subgroup analysis based on tumor type.
Figure 5.
The pooled r with corresponding 95% CIs for the subgroup analysis based on magnetic field strength, the index of the ADC value, the b value, age, and design.
Figure 6.
The funnel plot of the publication bias.
The result is suggestive of an indistinctive small study bias (P = 0.103).
Table 2.
Sensitivity estimates for each subgroup.