Table 1. Overview of summary statistics extracted from data.

Short name	Description	Use
cost	Experimental treatment in which the length of the detour participants have to make to help is changed.	Continuous explanatory variable
event A	A occurs if participants open the door for the other pedestrian from inside the central room.	Response and categorical explanatory variable
event B	B occurs if the computer-controlled pedestrian is rescued.	Response
event C	C occurs if participants open the door for the computer-controlled pedestrian from inside the corridor.	Not used in statistical analysis
age	Participants’ age in years.	Continuous explanatory variable
gender	Participants’ gender (male or female, as there was not enough data on additional categories).	Categorical explanatory variable
training 1	Time taken to move to the first target (log-transformed).	Continuous explanatory variable
training 2	Time taken to return from the first target to the starting position (log-transformed).	Continuous explanatory variable