Diagnosis and outcomes of acute kidney injury using surrogate and imputation methods for missing preadmission creatinine values

Table 4 Acute kidney injury staging according to minimal creatinine compared to preadmission creatinine

		Preadmission serum creatinine
		No AKI	1	2	3	Total
Minimal Scr	No AKI	281	1	0	1	283
	1	80	52	7	3	142
	2	12	18	12	2	44
	3	0	3	3	23	29
	Total	373	74	22	29	498

Kappa 0.502 (95% CI 0.437-0.567)
Misclassification rate was 26.1% (overestimation 23.3% and underestimation 2.8%) - McNemar p < 0.0001
p < 0.01 represented significant difference, with the Bonferroni correction

ISSN: 1471-2369