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Table 3 Own and cross price elasticity of SSBs

From: Evidence that a tax on sugar sweetened beverages reduces the obesity rate: a meta-analysis

Author/year/country Own-price elasticity Cross-price elasticity
Estimated SE Fruit juice SE Whole milk SE Diet drink SE
Barquera S, et al. (2008)[44], Mexico -1.085 0.195 -0.016 0.003 0.052 0.011   
Bonnet C, et al. (2011)[45], France 1 -2.206 0.133       
Claro RS, et al. (2012)[46], Brazil 2 -0.85 0.434       
Dharmasena S, et al. (2012)[42], USA 3 -2.255 0.550       
Finkelstein EA, et al. (2010)[47], USA -0.870 0.090       
Finkelstein EA, et al. (2013)[18], USA -1.320 0.005       
Fletcher JM, et al. (2010b)[48], USA 4 -4.445 1.806 1.857 2.332 7.67 2.156   
Lin BH, et al. (2011)[49], USA (Low-Income Population) -0.949 0.082 0.473 0.127 0.242 0.129 -0.23 0.104
Lin BH, et al. (2011)[49], USA (High-Income Population) -1.292 0.096 0.529 0.093 -0.054 0.13 -0.591 0.112
Smith TA, et al. (2010)[50], USA -1.264 0.089 0.557 0.095 0.222 0.126 -0.457 0.103
Overall -1.299 0.388 0.129 -0.423
(LCI – HCI) (-1.089 - -1.509) (0.0095 - 0.767) (-0.085 - 0.342) (-0.628 - -1.219)
  1. In all the next four cases the authors were contacted by email and could not provide any additional information to explain the missing values needed. To enable inclusion of the studies, we estimated the following values:
  2. 1Own-price elasticity: Consumer prices rose “by more than 3.4% on average” which led to a decrease in market share of 7.5%. Then -7.5/3.4 = -2.206. SE was inferred from Table VI: SE = (-0.07/1.16)*2.206 = 0.133.
  3. 2Information obtained from the paper: P < 0.05 at p(2-sides) = 0.05. Then SE = -[0.85]/1.96 = 0.434.
  4. 3The paper does not report SE, but only a p-value of 0.0000. It was used a website to derive an estimate of the Z-statistic (http://easycalculation.com/statistics/p-value-for-z-score.php). It was chose a value of 4.1, which is the lowest value that gives a two-sided p-value of 0.0000. Then SE = -[2.255]/4.1 = 0.550.
  5. 4SE inferred from mean and SE of grams of soft drink consumption (Table 4 in ref [48]): mean = -18.052, SE = 7.333, Ratio 7.33/-18.052 = -0.40622. Then SE = -4.445*-0.40622 = 1.806.
  6. The numbers in parenthesis denote 95% confidence interval.