Table 4.

Results of meta-analyses of the association of age and actigraphy-assessed sleep characteristics

	k	Participants	Meta-analytic effect size [95% CI], p-value
Overall	189	23 365
Sleep duration	89	21 242	r = −0.12 [−0.16, −0.08], p < .001
Efficiency	58	11 525	r = −0.05 [−0.10, −0.001], p = .05
Bedtime, ages 6–21	19	3055	r = 0.37 [0.23, 0.49], p < .001
Bedtime, ages 22 and older	7	3681	r = −0.66 [−0.87, −0.24], p = .004
Wake-up time, ages 6–21	9	748	r = 0.24 [0.05, 0.41], p = .01
Wake-up time, ages 22 and older	7	3625	r = −0.59 [−0.83, −0.15], p = .01

k indicates number of effect sizes.