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. 2009 Oct 29;7:13. doi: 10.1186/1740-3391-7-13

Figure 4.

Figure 4

ME Survey Scores for Young vs. Older Male and Female Subjects. Morning Evening Preference (ME) scores from the Horne-Ostberg questionnaire for young and older males and females. Males are shown in black (young) and dark gray (older). Females are shown in white (young) and light gray (older). There were main effects for sex (p = 0.02) and age (p = 0.02). The four age and sex groups analyzed show ME scores in the following progression: older females > young females > older males > young males. The higher the ME score, the greater the preference for morning activity.