Table 3:
Exact critical values for the Poisson based maximized SPRT, when surveillance does not start until the sample size is large enough to generate D expected events under the null hypothesis. T > D is the upper limit on the sample size. The minimum number of events needed to reject is set to M = 1. The type 1 error is α = 0.05. For some values of T and D, the critical values are conservative with α < 0.05. These are denoted in italics.
| D | ||||||||
|---|---|---|---|---|---|---|---|---|
| T | 0 | 1 | 2 | 3 | 4 | 6 | 8 | 10 |
| 1.5 | 2.964971 | 1.683208 | .. | .. | .. | .. | .. | .. |
| 2 | 3.046977 | 2.000158 | .. | .. | .. | .. | .. | .. |
| 2.5 | 3.110419 | 2.187328 | 1.600544 | .. | .. | .. | .. | .. |
| 3 | 3.162106 | 2.317139 | 1.766484 | .. | .. | .. | .. | .. |
| 4 | 3.245004 | 2.498892 | 2.089473 | 1.842319 | .. | .. | .. | .. |
| 5 | 3.297183 | 2.545178 | 2.267595 | 1.936447 | 1.611553 | .. | .. | .. |
| 6 | 3.342729 | 2.546307 | 2.406809 | 2.093835 | 1.921859 | .. | .. | .. |
| 8 | 3.413782 | 2.694074 | 2.572627 | 2.337771 | 2.211199 | 1.829011 | .. | .. |
| 10 | 3.467952 | 2.799333 | 2.591675 | 2.484834 | 2.298373 | 2.087405 | 1.834622 | .. |
| 12 | 3.511749 | 2.880721 | 2.683713 | 2.589388 | 2.415402 | 2.254018 | 1.965660 | 1.755455 |
| 15 | 3.562591 | 2.970411 | 2.794546 | 2.711996 | 2.556634 | 2.347591 | 2.203782 | 2.020681 |
| 20 | 3.628123 | 3.082511 | 2.918988 | 2.846635 | 2.717137 | 2.542045 | 2.425671 | 2.260811 |
| 25 | 3.676320 | 3.159490 | 3.011001 | 2.886783 | 2.827711 | 2.668487 | 2.527763 | 2.432668 |
| 30 | 3.715764 | 3.223171 | 3.080629 | 2.963485 | 2.911222 | 2.765594 | 2.634068 | 2.553373 |
| 40 | 3.774663 | 3.313966 | 3.186878 | 3.078748 | 3.030735 | 2.903286 | 2.789967 | 2.684730 |
| 50 | 3.819903 | 3.381606 | 3.261665 | 3.162197 | 3.117553 | 2.999580 | 2.897811 | 2.802863 |
| 60 | 3.855755 | 3.434748 | 3.320749 | 3.226113 | 3.162908 | 3.051470 | 2.978063 | 2.890933 |
| 80 | 3.910853 | 3.515052 | 3.407923 | 3.321868 | 3.247872 | 3.151820 | 3.090356 | 3.019184 |
| 100 | 3.952321 | 3.574091 | 3.472610 | 3.391377 | 3.321971 | 3.232345 | 3.155596 | 3.109251 |
| 120 | 3.985577 | 3.620223 | 3.523446 | 3.445695 | 3.379278 | 3.294843 | 3.222053 | 3.177847 |
| 150 | 4.025338 | 3.675035 | 3.583195 | 3.509028 | 3.446674 | 3.367227 | 3.298671 | 3.238461 |
| 200 | 4.074828 | 3.742843 | 3.655984 | 3.587079 | 3.528662 | 3.454679 | 3.391821 | 3.336012 |
| 250 | 4.112234 | 3.792978 | 3.710128 | 3.644349 | 3.588871 | 3.518954 | 3.459256 | 3.406929 |
| 300 | 4.142134 | 3.832686 | 3.752749 | 3.689355 | 3.636272 | 3.568952 | 3.512138 | 3.462111 |
| 400 | 4.188031 | 3.893093 | 3.785930 | 3.757574 | 3.707431 | 3.644405 | 3.591092 | 3.544518 |
| 500 | 4.222632 | 3.938105 | 3.835264 | 3.808087 | 3.760123 | 3.700032 | 3.649189 | 3.605012 |
| 600 | 4.250310 | 3.973710 | 3.874183 | 3.847892 | 3.801678 | 3.743656 | 3.694832 | 3.652326 |
| 800 | 4.292829 | 4.028089 | 3.933363 | 3.887512 | 3.864597 | 3.809685 | 3.763627 | 3.723608 |
| 1000 | 4.324917 | 4.047191 | 3.977453 | 3.931529 | 3.911308 | 3.858669 | 3.814122 | 3.776275 |