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In a study published in The Lancet in December 2004, David Morrison and Mark Petticrew surveyed around 300 Scottish fish and chip shops: 22% sold deep-fried Mars Bars, while an additional 17% of those surveyed had sold them in the past. Of the shops selling deep-fried Mars bars, three-quarters had only been selling them for the past 3 years. Average sales were 23 bars per week, although 10 outlets sold between 50 and 200 bars a week. The average price per bar was 60 pence, and the younger generation were the main purchasers—three-quarters were sold to children and 15% to adolescents.