Table 5.

The correlation between numbers of rib fracture and complication

	Patient with complication	Patient without complication	Sensitivity (95% CI )	Specificity (95% CI )	PPV (95% CI )	NPV (95% CI )	OR (95% CI)
Rib fx ≧2	102	49	94.5% (88–98%)	25.8% (16–38%)	67.6% (59–75%)	73.9% (52–90%)	5.90 (2.19–15.89%)
Rib fx≧3	90	27	83.3% (75–89%)	59.1% (46–71%)	76.9% (68–84%)	68.4% (55–80%)	7.22 (3.57–14.62%)
Rib fx≧4	75	16	69.4% (60–78%)	75.8% (64–85%)	82.4% (73–90%)	60.2% (49–71%)	7.10 (3.54–14.25%)
Rib fx≧5	51	4	47.2% (38–57%)	93.9% (85–98%)	92.7% (82–98%)	52.1% (43–61%)	13.87 (4.71–40.81%)
Total	108	66

CI confidence interval, PPV positive predictive value, NPV negative predictive value, OR odds ratio, fx fracture