Table 2

Positive (PPV) and negative (NPV) predictive values (95% CIs) for serology as an indicator of P aeruginosa ≥10⁵ colony-forming units/ml in bronchoalveolar lavage (BAL) fluid cultures

	N	Sensitivity	Specificity	PPV	NPV
Multiple P aeruginosa antigens
BAL
Discovery population	76	0.91 (0.74 to 1.0)	0.64 (0.57 to 0.72)	0.14 (0.06 to 0.23)	0.99 (0.97 to 1.0)
Test population	56	0.53 (0.28 to 0.79)	0.82 (0.75 to 0.88)	0.26 (0.1 to 0.41)	0.94 (0.89 to 0.98)

P aeruginosa exotoxin A
BAL
Discovery population	76	0.82 (0.59 to 1.0)	0.57 (0.485 to 0.65)	0.11 (0.04 to 0.18)	0.98 (0.95 to 1.0)
Test population	56	0.93 (0.80 to 1.0)	0.52 (0.43 to 0.61)	0.19 (0.10 to 0.28)	0.98 (0.96 to 1.0)