Comparison of cost between gluten-free (GF) and gluten-containing (GC) foods
| Product | n* | Gluten-free cost† (pence/100 g) | Gluten-containing cost† (pence/100 g) | P values | % Difference‡ 2017† | % Difference 201112 |
| All bread loaves | 37 | 64 (55–68) | 13 (10–23) | <0.001 | 400 (187–490) | 360 |
| White loaf | 20 | 61 (55–67) | 12 (9–29) | <0.001 | 467 (218–500) | – |
| Brown loaf | 17 | 66 (55–72) | 17 (11–23) | <0.001 | 324 (187–404) | – |
| All bread rolls | 37 | 90 (70–96) | 18 (13–27) | <0.001 | 379 (281–491) | 155 |
| White bread rolls | 20 | 90 (67–92) | 18 (13–27) | <0.001 | 384 (236–403) | – |
| Brown bread rolls | 17 | 96 (78–103) | 18 (12–27) | <0.001 | 386 (281–536) | – |
| Cereals—flaked | 15 | 85 (67–92) | 44 (33–44) | <0.001 | 109 (52–149) | 96§ |
| Cereal bars | 20 | 176 (153–193) | 132 (129–140) | 0.001 | 30 (6–46) | – |
| Pasta | 20 | 41 (34–59) | 28.5 (21–66) | 0.1 | 18 (−12 to 70) | 175 |
| Plain flour | 20 | 18 (17–35) | 9.5 (5–43) | 0.006 | 85 (−5 to 269) | 184 |
| Crackers/crispbreads | 20 | 160 (114–243) | 85 (69–109) | <0.001 | 122 (79–124) | 220 |
| Sweet biscuits | 15 | 130 (103–139) | 63 (62–66) | <0.001 | 107 (77–130) | 518 |
| Whole sponge cake | 15 | 83 (80–85) | 60 (48–67) | <0.001 | 35 (24–46) | 78 |
↵*Number of stores that stocked a GF and GC version of the food. Median (IQR) costs are presented for each food category from premium and regular supermarkets combined.
↵†Cost for each food category, for each individual supermarket, was calculated as a mean value between the cheapest and most expensive item; the median (IQR) was then calculated for all premium and regular supermarkets combined.
↵‡% Difference between cost of GF and GC food categories.
↵§Includes all GF breakfast cereals. 2011 data presented as mean values.