Table 2. Internal and external validation of our developed model.

Internal validation		Model 1	Model 2	Model 3
Calibration	Calibration Intercept	0.0003	0.0028	0.0004
	Calibration slope	0.9959	0.9981	0.9931
External validation
Discrimination	c statistic	0.965	0.964	0.964
	[95% CI]	[0.953–0.977]	[0.952–0.976]	[0.952–0.975]

Model 1: patients who were admitted to our hospital within 12 h after ingestion of paraquat.

Model 2: patients who were admitted to our hospital within 24 h after ingestion of paraquat.

Model 3: all patients who were admitted to our hospital at any time after ingestion of paraquat.