Table 1.

A hypothetical set of contingency tables. The ‘A’ allele frequency difference between treatment lines ‘TL1’ and ‘TL2’ are not consistent across the three replicates. A CMH‐test gives the following significant results: Chi‐squared = 55.66, df = 1, p < .0001, common odds ratio = 6.98

Replicate	Treatment line	Allele
		A	a
1	TL1	66	5
	TL2	90	3
2	TL1	72	3
	TL2	60	5
3	TL1	69	21
	TL2	6	72