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Table 2 Process evaluation of the price reduction intervention at post-intervention

From: A process evaluation of the Supermarket Healthy Eating for Life (SHELf) randomized controlled trial

Survey questions

Price reduction

n = 161a

% (n)

Combined

n = 160a

% (n)

P-value

Did you receive discounts on fruit and vegetables as part of this study? (implementation)

  

0.157

 Yes

84.8 (134)

78.4 (120)

 

 No

5.7 (9)

11.8 (18)

 

 Don’t know

9.5 (15)

9.8 (15)

 

If yes, did you buy more fruit and vegetables because of the discount? (effectiveness)

  

0.474

 Yes

65.4 (87)

62.7 (74)

 

 No

28.6 (38)

33.9 (40)

 

 Don’t know

6.0 (8)

3.4 (4)

 

Did you receive discounts on diet/low-calorie soft drinks or water as part of this study? (implementation)

  

0.429

 Yes

43.0 (68)

36.8 (56)

 

 No

30.4 (48)

36.8 (56)

 

 Don’t know

26.6 (42)

26.3 (40)

 

If yes, did you buy more diet/low-calorie soft drinks or water because of the discount (effectiveness)

  

0.684

 Yes

36.8 (25)

29.1 (16)

 

 No

58.8 (40)

67.3 (37)

 

 Don’t know

4.4 (3)

3.6 (2)

 

If you received discounts do you think that you bought less sugar-sweetened/full calorie soft drinks because of the discount on diet/low calorie soft drinks? (effectiveness)

  

0.389

 Yes

23.5 (16)

21.8 (12)

 

 No

61.8 (42)

70.9 (39)

 

 Don’t know

14.7 (10)

7.3 (4)

 

Please indicate how much you liked or disliked the discounts you were offered (implementation)

  

0.457

 5 I liked the discounts very much

68.8 (108)

65.1 (99)

 

 4

10.8 (17)

7.9 (12)

 

 3

7.6 (12)

9.9 (15)

 

 2

1.9 (3)

1.3 (2)

 

 1 I did not like the discounts

3.2 (5)

2.0 (3)

 

Did not receive

7.6 (12)

21 (13.8)

 

If you received discounts, did you use the ‘supermarket items included in our 20 % price discount’ handout we gave you to help you work out your discount? (implementation)

  

0.193

 Yes

53.1 (77)

45.8 (60)

 

 No

33.1 (48)

43.5 (57)

 

 Don’t know

13.8 (20)

10.7 (14)

 

If you received discounts did you buy things for others using your discount? (reach)

  

0.450

 Yes

13.8 (20)

11.5 (15)

 

 No

83.5 (121)

87.8 (115)

 

 Don’t know

2.8 (4)

0.8 (1)

 
  1. RE-AIM constructs examined are listed in brackets after each question
  2. Fisher’s exact tests and χ 2 tests (for categorical data) and two-sided unpaired t-tests with unequal variances were conducted to assess differences in survey responses between treatment groups. Unadjusted multinomial logistic regression with robust standard errors was used to assess differences between groups where Fisher’s or χ 2 tests revealed overall differences
  3. aRepresents highest possible sample size for each question. The sample size for each question differs due to missing responses