Figure 1

Boxplot of the answers about friendships and very good friendships. Top, numbers of students marked as “best friends” by students of each group (circle 1). Bottom, numbers of students marked as “friends” by students of each group (circle 2). Left, results from wave 1. Right, results from wave 2. Line represents the median, boxes the first and third quartiles, lines, the 95% confidence interval, and dots, outliers.