Table 1
Classification of DSPD cases
| Number | Percent | Cumulative Percent | |
| 1 Absolutely Certain | 72 | 35.1 | 35.1 |
| 2 Fairly Certain | 69 | 33.7 | 68.8 |
| 3 Questionable | 44 | 21.5 | 90.2 |
| 4 Unlikely | 16 | 7.8 | 98.0 |
| 5 Very Doubtful | 4 | 2.0 | 100.0 |
| TOTAL | 205 | 100.0 |
Figure 1
Distribution of morningness-eveningness scores. The percentiles of Horne-Östberg morningness-eveningness scores are plotted for 5 groups: a) absolutely certain DSPD 1, b) fairly certain DSPD 2, b) questionable DSPD 3, d) unlikely or very doubtful DSPD 4–5, and e) DSPD-C matched controls. Low HO scores indicate eveningness and high scores indicate greater morningness. In this study, the best criterion separating DSPD and DSPD-C was a score of 41.
Figure 2
Distribution of actigraphic sleep acrophases. The percentiles with an actigraphic sleep acrophase at or below each time are plotted versus clock hours after midnight. The percentiles are plotted for 5 groups: a) absolutely certain DSPD 1, b) fairly certain DSPD 2, c) questionable DSPD 3, d) unlikely or very doubtful DSPD 4–5, and e) a representative population sample of San Diego adults.
Figure 3
Distribution of bedtimes. The percentiles with a reported bedtime (week prior to completing the questionnaire) at or below each time are plotted versus clock hours after midnight. The percentiles are plotted for 6 groups: a) absolutely certain DSPD 1, b) fairly certain DSPD 2, c) questionable DSPD 3, d) unlikely or very doubtful DSPD 4–5, e) the DSPD-C, and f) a representative sample of San Diego adults.
Figure 4
Distribution of wake-up times. The percentiles with a reported wake-up times (week prior to completing the questionnaire) at or below each time are plotted versus clock hours after midnight. The percentiles are plotted for 6 groups: a) absolutely certain DSPD 1, b) fairly certain DSPD 2, c) questionable DSPD 3, d) unlikely or very doubtful DSPD 4–5, e) the DSPD-C, and f) a representative sample of San Diego adults.
Figure 5
Self reported comparison of bedtimes with other people. Self-reported bedtimes (in clock time after midnight) are reported for participants who stated that on average (after age 21) they went to sleep much earlier, somewhat earlier, about the same time, somewhat later, or much later that other people their age. Thick horizontal lines are medians. Red boxes show the 2nd and 3rd quartiles. Bars show the upper and lower 5%.