Comparison of sleep parameters from actigraphy and polysomnography in older women: the SOF study.
OBJECTIVE
Total sleep time (TST), sleep efficiency (SE), and wake after sleep onset (WASO) as assessed by actigraphy gathered in 3 different modes were compared to polysomnography (PSG) measurements. Each mode was compared to PSG to determine which was more accurate. Associations of the difference in TST measurement with demographics and sleep characteristics were examined.


METHODS
Observational study.


METHODS
Community-based.


METHODS
Sixty-eight women (mean age 81.9 years) from the latest visit of the Study of Osteoporotic Fractures who were concurrently measured with PSG and actigraphy.


METHODS
N/A.


RESULTS
In-home 12-channel PSG was gathered along with actigraphy data in 3 modes: proportional integration mode (PIM), time above threshold (TAT) and zero crossings mode (ZCM). The PIM mode corresponded better to PSG, with a mean overestimation of TST of 17.9 min. For the PIM mode, the estimation of TST and SE by PSG and actigraphy significantly differed (P < 0.01), while the estimation of WASO was similar (P = 0.27). The intraclass correlation between the 2 procedures was moderate to high (PIM mode: TST 0.76; SE 0.61; WASO 0.58). On average, the PIM mode underestimated TST by 68 min for those who slept < or = 5 hr, overestimated TST by 31 min for those with SE < 70%, and underestimated TST by 24 min for self-reported poor sleepers (P < 0.05).


CONCLUSIONS
Sleep parameters from actigraphy corresponded reasonably well to PSG in this population, with the PIM mode of actigraphy correlating highest. Those with poor sleep quality had the largest measurement error between the 2 procedures.
Blackwell
Terri
T
California Pacific Medical Center Research Institute, San Francisco, CA, USA. tblackwell@sfcc-cpmc.net
Redline
Susan
S
Ancoli-Israel
Sonia
S
Schneider
Jennifer L
JL
Surovec
Susan
S
Johnson
Nathan L
NL
Cauley
Jane A
JA
Stone
Katie L
KL
D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D017286:Polysomnography / Q000295:instrumentation*; D012892:Sleep Deprivation / Q000175:diagnosis / Q000453:epidemiology; D012893:Sleep Wake Disorders / Q000175:diagnosis* / Q000453:epidemiology*; D011795:Surveys and Questionnaires