Table 1. Sensitivity, Specificity, and Positive Predictive Value (PPV) Associated with IgG to MsgC1 Cutpoints at Each Time Interval Comparing PcP Cases and Controls.

Time	Samples in Cases	Samples in Controls	MsgC1 Cutpoint	Sensitivity	Specificity	PPV
Baseline	180	107	23	57.2	61.7	71.5
1–2 weeks	59	27	25	61.0	70.4	81.8
3–4 weeks	41	11	40.5	63.4	100	100
5–6 weeks	32	16	20.5	53.1	56.3	70.8

Note: We included 110 individual PcP cases and 63 individual controls in this study. Since some patients had their first specimen drawn at the time of hospital admission, but others had it drawn a day after admission, we defined baseline specimen to be specimen drawn on the day of hospital admission (day 0) or the following day after admission (day 1). Some subjects had specimens on both days and this resulted into 180 specimens for cases and 107 sample for controls.