Table 3.

Test accuracy of the BIOFIRE JI Panel for infection according to criteria and cultures (Methods section) as reference standard in patients with a clinical suspicion of native septic arthritis, early, or late acute PJIs.

All samples ( $n=\mathrm{45}$ )		95 % CI	Native septic arthritis	95 % CI	Early acute PJI	95 % CI	Late acute PJI	95 % CI
			( $n=\mathrm{12}$ )		( $n=\mathrm{14}$ )		( $n=\mathrm{19}$ )
% infection diagnosis	6/12 (50 %)		6/12 (50 %)		10/14 (71 %)		15/19 (80 %)
% BIOFIRE correct	73.3 %		91.7 %		50.0 %		78.9 %
Sensitivity	61.3 %	44–76	83.3 %	44–97	30.0 %	11–60	73.3 %	48–89
Specificity	100 %	78–100	100 %	61–100	100 %	51–100	100 %	51–100