Table 4.
Subgroup analysis of primary outcome variables
| Variable | Baseline | Follow-up | Intervention vs control at follow-up | |||
|---|---|---|---|---|---|---|
| Int. (n = 35) | Cont. (n = 35) | Int. (n = 27) | Cont. (n = 30) | Relative risk (95% CI) | P value | |
| Canteen menu does not contain foods and beverages restricted for sale (‘red’ or ‘banned’). | ||||||
| School size | ||||||
| •Small | 3 (33.33%) | 4 (36.36%) | 7 (77.78%) | 1 (14.29%) | 5.44 (0.86 to 34.55) | 0.04* |
| •Medium/large | 1 (3.85%) | 2 (8.70%) | 12 (66.67%) | 0 | 30.26 (1.91 to 478.45) | <0.01** |
| Socioeconomic region (SEIFA 2006) | ||||||
| •Least advantaged | 0 | 5 (31.25%) | 9 (81.82%) | 1 (7.69%) | 10.64 (1.59 to 71.37) | <0.01** |
| •Most advantaged | 4 (25.00%) | 1 (5.26%) | 10 (62.50%) | 0 | 22.24 (1.41 to 350.79) | <0.01** |
| Healthy canteen items (‘green’) represent >50% of products listed on the canteen menu. | ||||||
| School size | ||||||
| •Small | 0 | 1 (9.09%) | 7 (77.78%) | 3 (42.86%) | 1.81 (0.72 to 4.57) | 0.30 |
| •Medium/large | 5 (19.23%) | 6 (26.09%) | 15 (83.33%) | 5 (22.73%) | 3.67 (1.65 to 8.14) | <0.01** |
| Socioeconomic region (SEIFA 2006) | ||||||
| •Least advantaged | 2 (13.33%) | 4 (25.00%) | 11 (100.0%) | 4 (30.77%) | 3.25 (1.44 to 7.35) | <0.01** |
| •Most advantaged | 3 (15.00%) | 3 (15.79%) | 11 (68.75%) | 4 (23.53%) | 2.92 (1.17 to 7.32) | 0.01* |
*p value less than 0.05; **p value less than 0.01