Table 1.

Glass capacity (ml) by fortnightly period for each study

Fortnight	Study 1 (Restaurant A)	Study 2 (Restaurant A)	Study 3 (Bar A)	Study 4 (Bar B)
1	290	290	350	350
2	350	350	290	290
3	290a	290	350	350
4	450	450	450	450b
5	290	290	350	350
6	350	350	290	290
7	290	290	350b	350
8	450	450b	450	450
9	290	290	350	350
10		350
11		290
12		450
13		290

^aFollowing Fortnight 3, there was an excluded 2-week period for Study 1, when 230 ml glasses (rather than the 450 ml) were introduced to better match the glasses in the initial study on wine glass size (7), but these were withdrawn following customer complaints

^bDue to fidelity check violations (i.e. glasses not changed over on time), these periods lasted 3 weeks with establishments continuing to use this glass size for one extra week, although these additional weeks were not included in analyses