Table 1.

2×2 tables for hypothetical case-control study conducted using NVDRS to assess risk factors for teen suicide

	Dead controls: youth suicide decedents with antecedent serious illness				Ideal controls: controls drawn from same underlying population as cases
			Cases	Controls			Cases	Controls
Cases: Youth suicide decedents with no antecedent serious illness	Recent end of	+	60	10	Recent end of	+	60	30
	relationship	−	40	90	relationship	−	40	70
	OR			=13.5	OR			=3.5

NVDRS, National Violent Death Reporting System.