Table 2 Model development: the number of days with and without a positive blood culture (BC) for each sequential number of clinical signs, and the corresponding sensitivity, specificity and accuracy using a progressively higher number of signs to define a positive test result
No of clinical signsNo of days with positive BCNo of days without positive BCNo of signs cut-off for positive testSensitivity (%)Specificity (%)Accuracy (%)
0112391⩾0100.00.0100.0
119803⩾188.962.0150.9
215346⩾269.782.9152.6
319151⩾354.691.8146.4
41683⩾435.495.8131.1
5338⩾519.297.9117.1
61019⩾616.298.9115.0
7219⩾76.199.4105.4
825⩾84.099.9103.9
920⩾92.0100.0102.0
1000⩾100.0100.0100.0
Total993855