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mrueschman

mrueschman
Joined Oct 2013
Bio

Boston, MA

0000-0002-0506-8368

mrueschman
Joined Oct 2013
Bio

Boston, MA

0000-0002-0506-8368

PJ,

Thanks for inquiring and checking out the SHHS data. Good questions!

  • My initial thought is that subjective sleep efficiency would be difficult to assess in SHHS. On other sleep diaries we often have questions about awakenings during the night, yet the "Morning Survey" you cited is limited in that it doesn't really ask any questions about the time between going to sleep and waking up (besides Q4 for a subjective quality rating).

  • An accurate sleep efficiency measurement in SHHS1 was difficult to ascertain due to some of the limitations of the home sleep testing devices. As such, the slp_eff variable filters out many cases where it was noted during scoring that the entire in bed period may not have been captured on the recording. Some of the Signal Quality variables were used to censor values from slp_eff. Variables like latreliable, restan2, and restan3 were probably used. I think the exact filtering code may have been lost over time, though it has been on my back-back-burner to try and reverse engineer the filters that were used and make these more apparent in the variable metadata.

To the question about if it's "all right" to use slpeffp in SHHS1, it's a decision that each researcher can make to filter on certain criteria or not. Some of the efficiency values are probably not all that reliable. Unfortunately, this is one of the prevailing problems in analyzing SHHS1 data and the issue comes up fairly often. Thankfully most of the other studies do not share these sleep latency/efficiency challenges!