Table 3 Differences in intervention and control groups over time for primary and secondary trial outcomesa
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 | Main analysis | ||
Group by time differential effect (95% CI) | P | |||||
Primary Outcomes | ||||||
Mean % per student of lunch items that are ‘Everyday’ | 44.3 (34.3) | 48.1 (32.2) | 43.2 (36.3) | 40.8 (35.2) | 5.5 (2.2, 8.9) | 0.001* |
Mean % per student of lunch items that are ‘Occasional’ | 30.7 (30.8) | 30.4 (29.9) | 40.9 (35.7) | 43.4 (35.0) | −1.2 (−4.3, 2.0) | 0.47 |
Mean % per student of lunch items that are ‘Should not be sold’ | 25.0 (30.9) | 21.5 (29.0) | 16.0 (24.7) | 15.9 (24.5) | −4.4 (−7.0, −1.8) | 0.001* |
Secondary Outcomes | ||||||
Mean energy (kilojoules) per student lunch order | 2172.5 (976.9) | 2214.6 (937.4) | 1992.8 (793.1) | 1944.5 (740.8) | −15.3 (−78.3, 47.7) | 0.63 |
Mean saturated fat (grams) per student lunch order | 7.3 (5.7) | 7.3 (5.5) | 5.7 (4.4) | 5.3 (3.6) | −0.2 (− 0.5, 0.2) | 0.42 |
Mean sugar (grams) per student lunch order | 22.4 (22.8) | 22.8 (22.3) | 15.3 (16.2) | 13.9 (14.8) | 0.0 (−1.3, 1.4) | 0.97 |
Mean sodium (milligrams) per student lunch order | 778.9 (354.1) | 808.5 (361.6) | 808.3 (398.2) | 791.1 (397.5) | 24.5 (−3.9, 52.9) | 0.09 |
Mean weekly revenue per school ($AUD)b | 896.1 (449.9) | 1057.0 (387.2) | 769.6 (372.8) | 1053.7 (486.6) | −117.1 (−328.9, 94.6) | 0.23 |