Table 2.

Predictive performance of model 2 for the future value of serum creatinine (Cr).

Subgroup and validation method			MSE at different time points
			24 hours		48 hours		72 hours
Positive prediction
	Internal validation	0.04		0.04		0.06
	External validation	0.06		0.06		0.09
	External validation (refitting)	0.05		0.06		0.08
Negative prediction
	Internal validation	0.03		0.04		0.04
	External validation	0.06		0.06		0.08
	External validation (refitting)	0.03		0.05		0.05