Changes in prices, sales, consumer spending, and beverage consumption one year after a tax on sugar-sweetened beverages in Berkeley, California, US: A before-and-after study
Fig 2
Store price survey mean (95% CI) beverage price changes (cents per ounce) in Berkeley stores.
Top: price change between December 2014 (round 1) and March 2016 (round 3). Bottom: price change between December 2014 (round 1) and June 2015 (round 2). Sample limited to 55 product types with 313 prices across stores that were collected in all three rounds of the store price survey; of these, 56% were prices for taxed beverages and 44% for untaxed beverages. Prices account for inflation. Values in bold italics show the price difference between taxed and untaxed beverages. *Statistically significant difference between prices in later round (March 2016 or June 2015) compared to December 2014 at p < 0.05 using paired t-tests. **Statistically significant difference between prices in later round (March 2016 or June 2015) compared to December 2014 at p < 0.01 using paired t-tests. ‡Statistically significant difference of price of taxed beverages compared to untaxed beverages at p < 0.05 (unpaired t-tests since taxed and untaxed beverage items are different). Source: store price survey data collected by Public Health Institute.