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. 2012 Apr 1;35(4):571–577. doi: 10.5665/sleep.1748

Figure 1.

Figure 1

Mean (± 1 standard error) SDQ7 total scores (n = 285) for each PER3 genotype illustrating an additive genetic model. Sample sizes by genotype are n = 87 for PER34/4, n = 152 for PER34/5, and n = 46 for PER35/5. SDQ7, 7-item insomnia subscale of the Sleep Disorders Questionnaire.