Table 1.
Descriptive statistics
| Autism | Typical | DD | |
|---|---|---|---|
| Number of observations | 60 | 15 | 13 |
| Proportion male | 0.82 | 0.73 | 0.54 |
| Age (years) | 4.81 (1.88) 2.24–13.11 |
3.69 (1.33) 1.35–5.84 |
4.29 (1.19) 2.69–7.11 |
| Non-verbal ratio IQ | 56.92 (17.96) 25.07–114.20 |
107.97 (15.86) 80.57–142.81 |
58.06 (18.84) 9.61–76.63 |
| Total sleep time (hr) | 7.59 (1.66) 3.23–11.59 |
8.81 (0.93) 7.61–10.85 |
9.01 (0.88) 6.91–10.13 |
| Latency to sleep (min) | 39.4 (41.2) 0.0–144.0 |
44.8 (32.8) 6.5–114.0 |
33.2 (22.7) 0.0–93.5 |
| Sleep Efficiency (%) | 80.2 (12.7) 43.5–97.3 |
84.7 (7.7) 69.3–95.0 |
84.6 (8.1) 63.2–92.5 |
| Wake after sleep onset (min) | 73.5 (72.2) 0.5–358.9 |
51.7 (52.1) 10.0–178.7 |
66.2 (59.5) 14.0–203.9 |
| Stage 1 (%) | 5.4 (3.4) 0.4–16.6 |
4.0 (1.6) 2.0–7.9 |
2.3 (1.5) 0.6–4.8 |
| Stage 2 (%) | 56.9 (7.7) 37.8–75.3 |
55.9 (5.7) 47.6–69.5 |
60.9 (8.2) 50.6–74.4 |
| Stage 3 (%) or SWS (%) | 22.6 (6.6) 6.3–39.6 |
16.3 (5.4) 4.4–23.5 |
13.1 (6.8) 0.0–22.6 |
| REM (%) | 15.1 (5.6) 1.4–28.8 |
23.0 (4.9) 12.9–30.6 |
23.7 (6.2) 9.6–31.8 |
| REM latency (min) | 126.3 (86.8) 36.5–556.0 |
79.8 (34.2) 36.0–144.5 |
76.0 (28.6) 32.5–149.0 |
Note: Table shows means (first line), standard deviations (second line, in parentheses), and ranges (third line) by group (autism, typical, developmentally delayed).