Matched groups of 4, based on initial assessment of pain tolerance.
Pain relief score | |||||||||
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Tolerance group |
Control | Codeine only |
Acupuncture only |
Codeine + Acupuncture |
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This page gives three different examples of randomised block data.
The first example is artificially blocked using matched groups of 4. In the others, the blocks are natural groupings.
Note that the final example has two replicates for each treatment in each block.