Table 2.

Daily cost and mean difference in cost of diet for cardioprotective and control groups by supermarket; CRESSIDA study

	Cardioprotective (n 20) (£/d)				Control (n 20) (£/d)
	Baseline		End point		Baseline		End point
Supermarket	Mean	sd	Mean	sd	Mean	sd	Mean	sd	Mean difference (£/d)	95 % CI	P value*
Budget	5·26	1·70	5·58	1·80	5·22	1·57	5·50	1·35	0·09	−0·93, 1·10	0·86
Regular 1	6·01	1·94	6·21	1·95	5·92	1·67	6·54	1·50	−0·33	−1·45, 0·78	0·55
Regular 2†	5·72	1·87	5·97	1·90	5·66	1·56	6·08	1·41	−0·11	−1·18, 0·96	0·84
Quality†	7·78	2·43	7·94	2·57	7·41	2·13	8·00	1·98	−0·06	−1·53, 1·40	0·93
Mean all	6·19	1·97	6·43	2·05	6·05	1·72	6·53	1·53	−0·11	−1·26, 1·05	0·86

^* P value for between-group difference at end point using the independent-samples t test.

^†Factored costs.