Response distribution demonstrating minimal group preferences in 3-year-olds. The box-and-whisker plots show children’s responses across the three administered group affiliation measures. The boxes indicate the first and fourth quartiles. The solid lines inside the boxes represent the medians. The dashed lines capture the location of extreme values, with the exception of outliers (shown as circles) that exceeded the inter-quartile distance by more than 1.5. The horizontal, red dashed line indicates the chance level (50%).