Appendix A. Supplemental methodological details.

The broader Healthy Corner Store Initiative (HCSI) aimed to assess one-year changes in corner store purchases (nutritional characteristics, amount spent) following an environmental intervention to increase the availability of healthier food and beverage products. The baseline data for the HCSI evaluation did not include purchases. The one-year follow-up data collection included tobacco purchases, and those data were used for the current study.

Interviewers recorded the total spent on the purchase, inclusive of all items. For purchases with tobacco, the cost and quantity of tobacco products were recorded and the total cost of non- tobacco products was calculated by subtracting the tobacco cost from the total spent on the purchase.

Research staff that conducted intercept interviews were typically from the communities in which they were collecting data and were trained to interact with participants naturally and casually. Staff were also asked to write down the package information from viewing the product itself and immediately after the purchase (e.g., one minute after completing the transaction customers were stopped on their way outside of the store) to help minimize potential for reporting bias. When register receipts were available they were used to aid memory. It was not recorded whether receipts were available for the purchase or not, but it was anecdotally estimated that most customers did not receive receipts in small corner stores. Staff recorded the observed sex and participant-reported age category of the customer (adult: >19 years; adolescent:

13-18 years; child: 5-12 years), as well as what customers purchased (names and descriptions of items, amount of money just spent). Customers were also asked how frequently they visited the store. Frequency of visits to the corner store per week was categorized as <1 time, 1-2 times, 3-4 times, or 5-7 times. 2

Appendix A Table 1. Average Cost of Tobacco Products in Philadelphia by Brand, 2012 No. purchases Mean cost per Tobacco Brands SD Median Min Max including brand pack/itema ($) Newport 435 5.77 1.71 6.40 0.50 7.00 Dutch Master 72 1.19 0.30 1.25 0.50 2.50 Bluntville 37 1.14 0.18 1.25 0.75 1.75 37 5.04 0.85 5.00 2.50 8.95 Marlboro 25 6.26 0.51 6.50 5.00 6.75 Black and Mild 22 1.28 1.39 1.00 0.67 7.50 Entourage 22 1.24 0.14 1.25 1.00 1.75 Backwood 15 1.56 1.13 1.00 1.00 4.50 15 6.02 0.50 6.00 4.60 6.75 Blunt 10 1.25 0.19 1.20 1.00 1.50 USA Gold 10 5.11 0.30 5.00 5.00 5.95 Game 5 1.15 0.14 1.25 1.00 1.25 Swisher Sweets 5 1.65 1.88 0.89 0.67 5.00 Camel 4 5.88 0.48 5.75 5.50 6.50 Carnival 4 5.64 1.08 5.35 4.75 7.10 Parliament 4 6.70 0.48 6.90 6.00 7.00 Misty 3 5.39 0.19 5.50 5.17 5.50 3 4.24 3.48 6.25 0.22 6.25 American Spirit 2 5.83 1.66 5.83 4.65 7.00 Bensen and 2 7.75 0.35 7.75 7.50 8.00 Hedges 2 4.25 0.35 4.25 4.00 4.50 -Filter 2 6.25 1.77 6.25 5.00 7.50 Cloud 9 1 0.85 NA 0.85 0.85 0.85 1 3.00 NA 3.00 3.00 3.00 L & M 1 4.75 NA 4.75 4.75 4.75 Lucky Strikes 1 7.00 NA 7.00 7.00 7.00 Prince Albert 1 0.75 NA 0.75 0.75 0.75 Smokin Joes 100's 1 2.00 NA 2.00 2.00 2.00 Virginia Slim 1 7.10 NA 7.10 7.10 7.10 Wave 1 3.00 NA 3.00 3.00 3.00 White Owl 1 1.25 NA 1.25 1.25 1.25 1 6.50 NA 6.50 6.50 6.50 3

Note: purchases, or the illegal purchase of a single, unpackaged tobacco product that is not intended for individual sale, are included in the above data. 93 tobacco purchases were excluded (incomplete or missing brand information [n=50], the purchase included more than one tobacco product and individual price information could not be determined [n=14], or tobacco product price was missing [n=29]). a The cost per pack/item was based on the grouping for each product so the number of individual units varied by product.

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Appendix A Figure 1. Common food or beverage item categories by tobacco purchase type

Note: Data were collected in Philadelphia from April to September 2012