Table 3.

Validation of selected case definitions in a cohort of children and adolescents ages 1–15 years living in Quebec City or Sherbrooke, 2002–2011 (stage 2)

Algorithma	True positive (N)	False negative (N)	Sensitivity (%) (95% CI)	False positive (N)	True negative (N)	Specificity (%) (95% CI)	LR−	LR+
Two claims or any hospitalization in 2 years	292	3	99.0 (97.1–99.7)	0	365	100 (99.0–100.0)	0.010	N/A
Two claims or any hospitalization in 2 years +	292	3	99.0 (97.1–99.7)	0	365	100 (99.0–100.0)	0.010	N/A
Four claims in 2 years	284	11	96.3 (93.4–97.9)	0	365	100 (99.0–100.0)	0.037	N/A
Four claims or any hospitalization in 1 year	277	18	93.9 (90.6–96.1)	0	365	100 (99.0–100.0)	0.061	N/A

Note: ^aAll claims separated by 30 days except those indicated by +.

Abbreviations: LR, likelihood ratio.