Table 4.

Reference actigraphic values by age group and sex (mean ± SD [bold font] and range [minimum to maximum values])

	Pre-adolescent (8–10 years)		Early adolescent (11–13 years)		Mid-adolescent (14–15 years)		Late adolescent (16–17 years)
	M	F	M	F	M	F	M	F
n	50	50	100	145	113	93	59	61
Age (years)	9.7 ± 0.8	9.5 ± 1.0	12.5 ± 0.7	12.3 ± 0.7	15.0 ± 0.6	15.1 ± 0.5	16.7 ± 0.5	16.6 ± 0.5
Percent sleep	92.8 ± 4.4	93.8 ± 3.5	89.7 ± 5.2	91.9 ± 4.4	90.6 ± 4.6	92.5 ± 4.7	91.5 ± 4.9	93.2 ± 4.1
Range	81.3–98.9	84.8–99.7	76.5–98.4	78.7–99.5	77.4–98.9	76.5–99.5	78.6–98.5	83.0–99.5
Mean activity count	12.0 ± 3.3	11.0 ± 3.0	12.7 ± 3.2	11.0 ± 3.0	14.3 ± 4.0	11.5 ± 3.7	13.5 ± 4.3	11.4 ± 3.1
Range	4.3–18.3	4.3–16.6	6.0–20.1	4.4–20.2	5.9–26.3	5.6–22.5	6.1–23.7	5.7–19.6
Activity index	41.0 ± 12.0	36.7 ± 11.2	37.0 ± 9.6	31.9 ± 8.4	42.7 ± 11.4	35.3 ± 10.1	42.0 ± 9.9	38.4 ± 10.0
Range	14.8–70.4	14.5–62.6	17.8–60.7	14.4–55.4	19.2–73.6	14.5–62.7	21.1–60.8	17.1–59.4