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Table 1 Intervention schedule

From: Altering the availability of healthier vs. less healthy items in UK hospital vending machines: a multiple treatment reversal design

 Example intervention periods
Cold drinksSnacks
Period 1: Standardised75% healthier;
25% less healthy;
0% gaps
25% healthier;
75% less healthy;
0% gaps
Period 2: Decrease A*75% healthier;
5% less healthy;
20% gaps
25% healthier;
55% less healthy;
20% gaps
Period 3: Increase B*95% healthier;
5% less healthy;
0% gaps
45% healthier;
55% less healthy;
0% gaps
Period 4: Standardised75% healthier;
25% less healthy;
0% gaps
25% healthier;
75% less healthy;
0% gaps
Period 5: Decrease B*55% healthier;
25% less healthy;
20% gaps
5% healthier;
75% less healthy;
20% gaps
Period 6: Increase A*55% healthier;
45% less healthy;
0% gaps
5% healthier;
95% less healthy;
0% gaps
Period 7: Standardised75% healthier;
25% less healthy;
0% gaps
25% healthier;
75% less healthy;
0% gaps
  1. N.B. All study periods lasted 4 weeks.
  2. * The example proportions show the intervention schedule for machines assigned to increasing healthier items first; for half the machines the proportions shown for periods 2 and 3 were switched with those for periods 5 and 6