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Mean change in self-rated emotional closeness (1–10 analogue scale) towards all unrelated friends for male (filled bars) and female (open bars) subjects as a function of their spending less or more time engaged in activities (shopping, going out, helping, going away) or in conversation (indexed as time since last contact face-to-face or by phone) at month 9 than they had at month 0. Adapted from Roberts & Dunbar [43].
