Results of the meta-regression in all included renal transplant recipients.

r: coefficient of correlation; Tau2: REML estimate of between-study variance; I2-res: residual variation due to heterogeneity; Adjusted R2: proportion of between-study variance explained.
a covariate “Hardy-Weinberg equilibrium” dropped because of collinearity.
b method: method of concentration measured;
*method: method of concentration measured.
a

r: 相关系数（coefficient of correlation）；Tau2: 研究间方差的限制性最大似然（REML）估计值；I2-res: 异质性所致残差变异；校正决定系数（Adjusted R2）: 研究间方差的解释占比。
a 协变量"哈迪-温伯格平衡（Hardy-Weinberg equilibrium）"因共线性被移除。
b 方法：浓度测定方法；
*method：浓度测定方法。
a