Table 1.

Variables considered for statistical models

Model	Variable	Description
All models	Vegetarian availability	Number of vegetarian options/total options available
	Total options available	Number of different meal options offered at a mealtime
	Total main meals sold	Number of main meals sold at a mealtime
	Vegetarian price differential (£)	Difference between mean cost of the meat options and vegetarian options
	Ambient temperature (°C)	Mean temperature over 24 h each day in Cambridge (°C) (49)
	Day	Monday, Tuesday, Wednesday, Thursday, Friday
	Week of term	1 to 11
For study 1 only (no variation in study 2)	Meal	Lunch or dinner
	Term	Spring, summer, autumn
For individual-level models only	Individual diner as a random effect
For individual-level models and models of total sales considering diner background	Prior level of vegetarian meal consumption	Individual diners at each college were divided into least, less, more, and most vegetarian quartiles, and we tested for any interaction effects with vegetarian availability
For study 2 rebound model	Week condition	Control or experimental week