Table 2.

The results of the administration and delivery cost analyses

Method	Cost per dose		Cost per vaccination		Test
	Arm A	Arm B	Arm A	Arm C
Method 1	$0.24	$0.36	–	–	–
Method 1	–	–	$4.55	$5.40	–
Method 2	$0.32	$0.47	–	–	t = −2.5, df = 51, p = 0.017
Method 2	–	–	$5.65	$6.32	t = −1, df = 56, p = 0.32

The cost per deworming dose and per rabies vaccination for each Arm of the study as calculated by the two different calculation methods is given. Method 1 has calculated the average of a ratio, whilst Method 2 has calculated the ratio of averages (or totals). Method 1 is useful as an aggregate measure over all clinics, but cannot be used to test for statistical differences across clinic categories because it is not calculated on a per clinic basis. Method 2 allows testing for statistical differences across clinic types, but represents a summary statistic for clinic-level cost per dose measure rather than an aggregate measure. The result of the statistical analysis of Method 2 is given