Table 5.

Diagnostic indexes for pneumonia using the proposed D-dimer-based screening strategies

Screening strategy	TP	TN	FN	FP	N	Sensitivity	Specificity	LR(-)	Posterior Probability
D-dimer < 500 ng/mL	77	136	16	449	678	82.8%	23.2%	0.74	10.5%
D-dimer < 1000 ng/mL	66	283	27	302	678	71.0%	48.4%	0.60	8.7%
D-dimer < 500 or <1000 if Age >70	75	167	18	418	678	80.6%	28.5%	0.68	9.7%
Wells ≤4 and D-dimer <500 ng/mL	83	96	10	489	678	89.2%	16.4%	0.66	9.4%
Wells≤4 and D-dimer <1000 ng/mL	76	204	17	381	678	81.7%	34.9%	0.52	7.7%
RGS≤6 and D-dimer <500 ng/mL	84	101	9	484	678	90.3%	17.3%	0.56	8.2%
RGS≤6 and D-dimer <1000 ng/mL	81	196	12	389	678	87.1%	33.5%	0.39	5.8%

Abbreviations are the same as Table 4