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Table 2 Baseline differences between control and intervention stores for average proportion (95%CI) of total weekly food sales for Nutri-Score A,B,C,D,E by season (year = 2018)

From: The impact of shelf tags with Nutri-Score on consumer purchases: a difference-in-difference analysis of a natural experiment in supermarkets of a major retailer in Belgium

Control stores (N = 14)a

Intervention stores (N = 43)

Winter

Winter

A

33.3 (32.4–34.1)

A

34.1 (33.1–35.1)

B

19.8 (19.4–20.2)

B

19.6 (19.2–20.0)

C

14.3 (14.2–14.5)

C

14.1 (13.9–14.3)

D

26.3 (25.6–27.0)

D

27.6 (23.0–32.1)

E

15.0 (14.6–15.3)

E

14.4 (14.0–14.8)

Spring

Spring

A

42.6 (41.7–43.5)

A

42.9 (41.6–44.1)

B

16.5 (16.2–16.9)

B

16.2 (15.8–16.6)

C

17.5 (17.2–17.8)

C

17.1 (16.7–17.5)

D

25.8 (25.2–26.3)

D

24.9 (24.3–25.5)

E

12.6 (12.2–12.9)

E

12.1 (11.8–12.5)

Summer

Summer

A

40.0 (39.4–40.6)

A

40.9 (38.4–43.3)

B

17.1 (16.7–17.5)

B

16.9 (16.0–17.8)

C

17.7 (17.4–18.0)

C

17.8 (16.7–18.9)

D

25.5 (25.0–26.1)

D

25.2 (23.8–26.5)

E

12.8 (12.5–13.2)

E

12.5 (11.7–13.3)

Autumn

Autumn

A

43.2 (42.4–44.1)

A

44.6 (43.6–45.7)

B

18.7 (18.2–19.2)

B

18.3 (17.9–18.7)

C

19.3 (19.0–19.6)

C

19.4 (19.0–19.7)

D

30.2 (29.4–30.9)

D

29.8 (29.1–30.4)

E

15.4 (15.1–15.8)

E

15.1 (14.7–15.5)

  1. aAverages across stores taken, some stores get a higher weight as they are control store to multiple intervention stores
  2. Seasons: winter (Jan/Feb/March), spring (April/May/June), summer (July/August/September) and autumn (October, November, December)