Table 4.
Time Trend in Brand-Level Water Products Volume Sales Change Between 2016 and 2018
| Beverage | Time trend,a Mean (SE) (oz) |
Difference in time trend between HC and CSb Mean (SE) (oz) |
|
|---|---|---|---|
| HC | CSs | ||
| Plain water | 81.4 (65.1, 97.8) | −58.1 (−75.1, 41.2) | 99.2 (76.4, 121.9) |
| Carbonated water | 27.0 (23.8, 30.1) | 12.6 (11.1, 14.2) | 13.3 (10.2, 16.4) |
| Carbonated water with non-nutritive sweetener | 6.6 (5.2, 8.0) | 9.6 (8.1, 11.0) | −2.4 (−4.1, 0.70) |
| Flavored water | 3.0 (1.7, 4.3) | 4.7 (4.1, 5.4) | −2.7 (−4.2, 1.2) |
| Flavored water with non-nutritive sweetener | 8.2 (7.3, 9.1) | 12.9 (12.0, 13.7) | −4.3 (−5.4, 3.1) |
| Flavored water with added sugar | 1.0 (0.7, 1.4) | 3.6 (3.1, 4.1) | −2.1 (−2.6, 1.5) |
Note: Boldface indicates statistical significance (p<0.001).
a
These time trend means were estimated using separate models for HC and CS.
b
The difference in time trends between HC and CS was estimated by an interaction term in the combined model with multiple covariates. Therefore, this value does not equal the simple difference between the HC and CS models. See more details in the Appendix (available online).
CS, control store; HC, Howard County.