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. Author manuscript; available in PMC: 2018 Jan 13.
Published in final edited form as: Psychosom Med. 2008 Oct 8;70(9):1050–1059. doi: 10.1097/PSY.0b013e31818425fb

Figure 1.

Figure 1

Affiliative reciprocity predicts lifespan. A, Rats that affiliate more reciprocally live longer. Median survival for “High reciprocity” rats (dotted line) (upper 50th percentile of affiliative reciprocity scores) was 776 days; median survival for “Low reciprocity” rats (solid line) (lower 50th percentile) was 612 days. Affiliative reciprocity scores were dichotomized for graphical purposes only. B, Cox proportional hazards survival analysis was applied to estimate the effect of affiliative reciprocity on lifespan (HR = 1.31, 95% CI = 1.13–1.51; p = .0005).