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. Author manuscript; available in PMC: 2013 Sep 12.
Published in final edited form as: Am J Hum Biol. 2009 Nov-Dec;21(6):762–768. doi: 10.1002/ajhb.20927

Figure 2.

Figure 2

Distribution of individual circadian rhythm [defined as (log2TPM)–(log2TAM) in Study A and as [(log2TPM-MON + log2TPM-WED + log2TPM-FRI)/3] – [(log2TAM-MON + log2TAM-WED + log2TAM-FRI)/3)] in Study B] during late winter and during other seasons in Study A (left) and B (right). Diurnality <0 has higher TAM than TPM. Mean in each sample is indicated by a dashed line. There is substantial individual variation in diurnality in each sample and season. The seasonal difference in diurnality arises from a larger proportion of the sample having TPM>TAM in late winter than in other seasons (see text for additional discussion).