Table 3

Smear and culture results for all SE, smear negative and smear positive SE
Description All smears All cultures Cultures in SN SE Cultures in SP SE
Number of SE 2537 2537 2060 477
Observed # of P SE after 1 specimen 377 682 253 429
Observed # of P SE after 2 specimens 477 733 301 432
Proportion of P SE on 1st specimen 0.149 0.269 0.123 0.899
Proportion of NP SE 0.060 0.042 0.040 0.103
# of P SE missed by failing to do 2nd specimen 31 27 25 2
Expected # of P SE after 1 specimen 377 682 253 429
Expected # of P SE after 2 specimens 508 760 326 434
Expected proportion of P SE after 1 specimen 0.149 0.269 0.123 0.899
Expected proportion of P SE after 2 specimens 0.200 0.299 0.158 0.910
Potential IY for 1st specimen 0.743 0.898 0.776 0.989
Potential IY for 2nd specimen 0.257 0.102 0.224 0.011
Overall fraction of P on 1st specimen 0.149 0.269 0.123 0.899
Overall fraction of P on 2nd specimen 0.052 0.031 0.035 0.010
NND on 1st specimen 7 4 8 1
NND on 2nd specimen 19 33 28 96

Legend: S = smear, P = positive, N = negative, SE = Suspect Episodes, NND = number needed to diagnose (see Methods for details), IY = incremental yield.

Demers et al.

Demers et al. BMC Infectious Diseases 2012 12:218   doi:10.1186/1471-2334-12-218

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