Free (N = 66) | Intermittent (N = 24) | |
---|---|---|
PPV, positive predictive value; NPV, negative predictive value. | ||
Predictive values were calculated on the basis of the prevalence of P aeruginosa after 2 years based on the serum antibody results (15/66 (22.7%) in the P aeruginosa free group and 13/24 (54.2%) in the intermittently infected group) to determine the probability for a CF patient to shift his or her P aeruginosa status depending on the antibody titre. | ||
PPV % (95% CI) | 33.3 (0.8 to 90.6) | 83.0 (51.6 to 97.9) |
n/N | 1/3 | 10/12 |
NPV % (95% CI) | 77.8 (76.5 to 94.4) | 58.0 (27.7 to 84.8) |
n/N | 49/63 | 7/12 |