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Table 3 Smear and culture results for all SE, smear negative and smear positive SE

From: High yield of culture-based diagnosis in a TB-endemic setting

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