Table 4 Impact of the intervention on student’s mean percentage of ‘Everyday’ online lunch items: subgroup analysisa
Variable | Intervention | Control | Intervention vs Controla | |||||
|---|---|---|---|---|---|---|---|---|
Baseline Mean (SD) n = 656 students | Follow up Mean (SD) n = 463 students | Baseline Mean (SD) n = 675 students | Follow up Mean (SD) n = 536 students | Group by time differential Effect (95% CI) | P | Group by time by Subgroup differential effect (95% CI) | P | |
Student grade | ||||||||
Grade 7–9 | 44.0 (33.8) | 47.2 (32.1) | 42.8 (36.1) | 41.6 (36.0) | 3.9 (0.2, 7.7) | 0.04 | – | – |
Grade 10–11 | 45.4 (35.9) | 51.2 (32.8) | 44.6 (37.3) | 37.1 (31.2) | 11.7 (4.2, 19.1) | 0.002 | 7.7 (−0.6, 16.1) | 0.07 |
Frequency of use | ||||||||
High users (≥1 order / week on average) | 43.9 (29.7) | 49.0 (32.4) | 43.8 (30.9) | 40.7 (32.3) | 7.7 (2.5, 12.9) | 0.004 | 3.88 (−2.92, 10.69) | 0.26 |
Low users (< 1 order / week on average) | 44.6 (36.7) | 47.4 (32.2) | 42.7 (39.2) | 40.8 (37.2) | 3.85 (−0.5, 8.2) | 0.08 | – | – |
School sector | ||||||||
Government | 43.9 (36.5) | 45.9 (33.1) | 29.9 (30.1) | 27.3 (27.8) | 5.1 (−1.4, 11.7) | 0.12 | – | – |
Non-Government | 44.6 (33.2) | 49.4 (31.7) | 46.6 (37.0) | 44.1 (36.0) | 6.0 (2.0, 10.0) | 0.003 | 0.9 (−6.8, 8.5) | 0.82 |