Page 84 - ON THE WAY TO HEALTHIER SCHOOL CANTEENS - Irma Evenhuis
P. 84

Chapter 5. Effect evaluation
Intervention effect on health level of the canteen
Table 5.2 shows that intervention schools (IS) scored higher in terms of the healthier offering in the cafeteria (77.2%), compared to control schools (CS) (60.1%) after the intervention. Figure 5.2 confirms this and shows that nine of the ten IS increased the healthier offering (range of all IS: −3 to 57%, mean change 31.4%). In comparison, eight of the ten CS showed positive changes but the change (range of all CS: −9 to 46%, mean change 9.7%) was smaller compared to the IS. The healthier offering in vending machines increased in five of the ten IS (range of all IS: −15 to 33%, mean change 5.1%) and in three of the nine CS (range al all CS: −14 to 48%, mean change 5.3%) (Figure 5.3), although, on average, both groups made broadly similar changes in their offer (Table 2). With regard to the accessibility criteria, both groups showed overall increases, although two CS also showed decreases (Figure 5.4). The change in IS was higher compared to CS (range of all IS: 0 to 50%, mean change 15%; range of all CS −30 to 20%, mean change 7%), resulting in mean scores of 59% (IS) and 50% (CS) fulfilled accessibility criteria after the intervention.
Table 5.2. Sub scores of a healthier canteen pre- and post-intervention, stratified by intervention and control schools.
 c One control school did not have a vending machine (N=9, in control schools).
Figures. -20 d Nine criteria could be fulfilled, scoring 10% per criteria (0-90%). -30
(bron: Kantinescan_M1_M2_Ruw_excel) CONTROL:
School Number INTERVENTION
Intervention schools (N=10) Control schools (N=10)
T0
45.80 (27.12)
44.70 (19.40)
44.00
(20.66) (19.69)
Mean
T1
77.20 (13.41)
49.80 (20.33)
(bron: KantineTsc0an_M1_M2_RTuw1_excel) change
30 20 10
Figures.
Mean change
 Healthier products available in the cafeteria ab
Healthier products available at vending machine abc
Fulfilled accessibility criteria ad
a Mean score (SD).
b Scored in percentage (0-100%).
31.4 50.40 CONTROL: (23.00)
60 5.1 50
60.10 9.7 (15.67)
59.00
43.00 50.00 20.0 (20.58) (14.91)
0
-10 1 2 3 4 5 6 7 8 9 10
40
38.89
(24.30) (22.99)
15.0
44.22 5.3
  60 50 40 30 20 10
0
-10 1 2 3 4 5 6 7 8 9 10
   -20 -30
School Number
   60 50 40 30 20 10
0
-10 1 2 3 4 5 10
    -20 -30
School Number
6
78
9
  (a) Control Schools INTERVENTION
(b) Intervention Schools
Figure 5.2. Histogram of the changes in healthier products available in the cafeteria.
60 50 40 30 20 10
82 0
-10 -20
Figure 2. Histogram of the changes in healthier products available in the cafeteria.
1 2 3 4 5 6 7 8 9 10
Change in Healthier Offer in Change in Healthier Offer in Cafeteria Cafeteria
Change in Healthier Offer in Change in Healthier Offer in Cafeteria Cafeteria
                        -30




































   82   83   84   85   86