TABLE 2.
Summary of Actigraph Sleep–Wake Variables Over 6 Months
| Actigraph Variable | Time 1a M ± SD (Q1–Q3) | Time 2b M ± SD (Q1–Q3) | Time 3c M ± SD (Q1–Q3) |
|---|---|---|---|
| Bedtime (hours:minutes) | |||
| AUT | 21:01 ± 1:08 (20:18–21:31) | 21:00 ± 1:14 (20:11–21:40) | 20:47 ± 1:37 (20:06–21:44) |
| DD | 21:08 ± 1:01 (20:36–21:41) | 21:07 ± 1:02 (20:37–21:42) | 20:59 ± 1:19 (20:24–21:33) |
| TYP | 20:46 ± 0:51 (20:10–21:05) | 20:55 ± 0:54 (20:21–21:17) | 20:50 ± 0:59 (20:21–21:15) |
| Sleep onset latency (minutes) | |||
| AUT | 39 ± 28 (23–46) | 33 ± 23 (16–44) | 36 ± 31 (17–47) |
| DD | 42 ± 31 (24–50) | 41 ± 28 (23–54) | 42 ± 26 (26–51) |
| TYP | 35 ± 19 (25–41) | 36 ± 19 (20–45) | 38 ± 21 (21–46) |
| WASO duration (minutes) | |||
| AUT | 19 ± 17 (8–25) | 17 ± 16 (6–26) | 16 ± 16 (5–23) |
| DD | 29 ± 22 (14–36) | 25 ± 21 (9–34) | 23 ± 24 (6–38) |
| TYP | 18 ± 12 (9–24) | 18 ± 14 (7–24) | 15 ± 12 (7–19) |
| WASO number | |||
| AUT | 2.5 ± 1.7 (1.4–3.0) | 2.1 ± 1.5 (1.0–2.7) | 2.1 ± 1.7 (0.9–3.0) |
| DD | 3.7 ± 2.4 (2.3–5.0) | 3.3 ± 2.5 (1.5–4.3) | 3.1 ± 2.5 (0.9–4.6) |
| TYP | 3.1 ± 1.8 (1.7–4.3) | 3.2 ± 2.5 (1.4–4.0) | 2.9 ± 2.2 (1.3–4.0) |
| Sleep efficiency (%) | |||
| AUT | 91 ± 5 (90–94) | 92 ± 4 (91–96) | 92 ± 5 (90–96) |
| DD | 90 ± 5 (86–93) | 91 ± 5 (87–95) | 91 ± 6 (88–95) |
| TYP | 92 ± 3 (90–95) | 92 ± 4 (89–95) | 92 ± 4 (90–95) |
| Total sleep in 24 hr (hours:minutes) | |||
| AUT | 10:36 ± 0:51 (10:06–11:09) | 10:30 ± 0:44 (9:50–11:05) | 10:39 ± 1:41 (9:54–10:56) |
| DD | 11:06 ± 0:55 (10:21–11:46) | 10:56 ± 0:51 (10:08–11:37) | 11:06 ± 1:16 (10:15–11:26) |
| TYP | 11:14 ± 0:44 (10:42–11:39) | 10:58 ± 0:46 (10:23–11:32) | 10:59 ± 0:45 (10:30–11:34) |
Note. Time = each recording time separated by 3 months; Q1 = lower quartile (cuts off lowest 25% of data); Q3 = upper quartile (cuts off highest 25% of data); AUT = autism; DD = developmental delay without AUT; TYP = typically developing; WASO = wake after sleep onset.
a
n = 194.
b
n = 179.
c
n = 173.