Table 3. Yield of first and Incremental yield of the second and third serial sputum culture.
| Observed and expected incrementalyield | LJ | MGIT | LJ orMGIT |
| Observed yield from 1st sputum culture: | 0.212 | 0.259 | 0.306 |
| Observed yield from 2nd sputum culture: | 0.042 | 0.119 | 0.069 |
| Observed yield from 3rd sputum culture: | 0.024 | 0.043 | 0.043 |
| Total positives observed | 43 | 60 | 62 |
| Missed TB cases %¥ | |||
| Positives missed by not doing a 2nd sputum culture | 0.7 | 2.0 | 1.2 |
| Positives missed by not doing a 3rd sputum culture | 1.1 | 1.8 | 1.7 |
| Total positives missed | 1.8 | 3.8 | 2.9 |
| Expected yield from 3 sputum cultures (Exp)π | 44.8 | 63.8 | 64.9 |
| Expected Yield (Fraction)† | |||
| Observed pattern (n) + missed TB cases/Exp | 1.000 | 1.000 | 1.000 |
| Expected from the first sputum culture‡1 | 0.805 | 0.690 | 0.801 |
| Expected from second sputum culture ‡2 | 0.127 | 0.236 | 0.126 |
| Expected from third sputum culture‡3 | 0.068 | 0.075 | 0.073 |
LJ (Solid culture) = Lowenstein Jensen, MGIT (Liquid culture) = Mycobacterium Growth Indicator Tube.
¥ = Number of estimated TB cases missed among those who never submitted the 2nd and 3rd sputum sample for culture, assuming a same proportion of TB cases as in those who submitted the 2nd and 3rd sputum for culture, respectively. † = The proportion of TB cases expected if each of the suspects had a complete set of three sputum cultures, Π = Total positives observed + total positives missed, ‡1 = Px/Exp, ‡2 = NPx + missed by second/ExP and ‡3 = NNP + missed by third/Exp.