Table 8 Estimated dispersion parameters and tests of significance

Model	Dispersion parameter, n (95% CI)	χ²*
BOADICEA	0.81 (0.74 to 0.88)	28.12
BRCARPO	0.71 (0.64 to 0.77)	81.52
IBIS	0.64 (0.59 to 0.70)	163.22
Myriad tables	0.87 (0.80 to 0.94)	13.46

*Test statistic for the dispersion parameter being equal to 1 (1 degree of freedom test).