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. Author manuscript; available in PMC: 2010 Aug 9.
Published in final edited form as: Chronobiol Int. 2010 Jan;27(2):363–377. doi: 10.3109/07420520903419157

Table 2.

Mean (95% CI) Rest/Activity Rhythm Parameters by Age Group

Age Groups
<=69
(n=259)		 70–74
(n=1026)		 75–79
(n=851)		 80+
(n=828)
Acrophase † 14.32 (14.18–14.47) 14.25 (14.18–14.33) 14.23 (14.15–14.31) 14.33 (14.25–14.42)
Amplitude* 3870 (3740–4000) 3794 (3728–3859) 3650 (3578–3722) 3257 (3184–3330)
Mesor* 2223 (2163–2284) 2227 (2196–2257) 2190 (2157–2224) 2058 (2024–2092)
F-value* 1151 (1090–1213) 1124 (1093–1155) 1058 (1024–1092) 930 (896–965)
Beta* 16.29 (8.56–24.02) 20.61 (16.7–24.49) 21.67 (17.41–25.93) 41.71 (37.39–46.03)
Alpha‡ −0.31 (−0.34,−0.27) −0.29 (−0.31,−0.27) −0.28 (−0.30,−0.26) −0.29 (−0.31,−0.27)

CI refers to confidence interval

*

P-trend<.001;

†

P-trend=0.481;

‡

P-trend=0.426