Table 2. Summary of the longitudinal associations between implementation of checkout food policies and purchases of common checkout foods, estimated from interrupted time series models (best-fit comparison group).
| Intervention supermarket | 1,000s of units of common checkout food purchases per % market share per 4 weeks (95% CI) | |||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Comparison supermarket | 9 | 8 | Mean of 7, 8, 9 | 9 | None | Mean of 7, 8, 9 |
| Level change (4 weeks) | −461.6 (−1,016.3 to 93.1) | −108.7 (−137.1 to −80.4) | −435.8 (−690.0 to −181.5) | −178.7 (−294.0 to −63.3) | −54.2 (−274.8 to 166.4) | −118.1 (−326.9 to 90.7) |
| Trend change | −6.8 (−25.0 to 11.5) | −6.1 (−10.3 to −1.9) | 14.8 (−11.4 to 41.0) | −2.7 (−14.2 to 8.8) | 1.3 (−12.8 to 15.4) | −3.1 (−32.1 to 25.9) |
| Change (at 12 months) | −483.6 (−994.2 to 21.1) | −194.0 (−270.9 to −117.1) | −212.2 (−549.0 to 124.6) | −205.7 (−370.4 to −40.9) | −37.3 (−243.4 to 168.9) | −158.3 (−538.3 to 221.6) |
All models are adjusted for market share, four-weekly time point, and Easter (if Easter fell in different four-weekly periods between years).
Abbreviation: CI, confidence interval.