Table 4 |
||||
Relative and absolute incremental yields and NND for smear and cultures | ||||
Relative incremental yield vs. | ||||
Yield | 1st S | 2 S total | 1st C | |
Expected # of P after 1 S = 377/2537 = 14.9% | ||||
Expected # of P after 2 S = 508/2537 = 20.0% | 1.3 | |||
Expected # of P after 1 C = 682/2537 = 26.9% | 1.8 | 1.3 | ||
Expected # of P after 2 C = 760/2537 = 29.9% | 2.0 | 1.5 | 1.1 | |
Absolute incremental yield vs. | ||||
Yield | 1st S | 2 S total | 1st C | |
Expected # of P after 1 S = 377/2537 = 14.9% | ||||
Expected # of P after 2 S = 508/2537 = 20.0% | 5.2% | |||
Expected # of P after 1 C = 682/2537 = 26.9% | 12.0% | 6.9% | ||
Expected # of P after 2 C = 760/2537 = 29.9% | 15.1% | 9.9% | 3.1% | |
NND vs. | ||||
NND | 1st S | 2 S total | 1st C | |
1st Smear | 7 | |||
2 Smears total | 5 | 19 | ||
1st Culture | 4 | 8 | 15 | |
2 Cultures total | 3 | 7 | 10 | 33 |
Legend: S = smear, P = positive, N = negative, SE = Suspect Episodes, NND = number needed to diagnose (see Methods for details), IY = incremental yield. Note: Expected # of P after 1 S or C is same as Observed (see Appendix for details).
Demers et al.
Demers et al. BMC Infectious Diseases 2012 12:218 doi:10.1186/1471-2334-12-218