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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 drinks

Snacks

Period 1: Standardised

75% 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: Standardised

75% 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: Standardised

75% 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