Banks (2010) conducted neurobehavioral assessments on every day of sleep restriction (including the first one). See Figure 2 in their paper.
I’m not sure why that’s relevant to my question? They still did 5-6 days (depending on whether you count the recovery day, on which many SR subjects got even less sleep than before) of sleep restriction in total. Unless Lowe is only counting the results from the first day of sleep restriction, which is possible but seems unlikely, describing this as 1 day of cumulative sleep restriction duration seems inaccurate. However, I will withhold judgment until I hear back from Lowe.
Huh. I had assumed they might have been only including the first day, but you’re right that that’s unlikely. Probably a typo.
That wouldn’t change their overall meta-analytic effect sizes, though, since they aggregate across different durations of sleep restriction when calculating it.
If it was indeed a typo (there is at least one more in the same table—Saleh (2003) is duplicated when there should be one entry for 2003 and one for Saleh 2011). On the other hand, it’s possible it was miscoded or misinterpreted. I’d be surprised if that were the case, but it’s hard to see, for example, how they came up with a number for “mean hours of sleep deprivation” given the 6 different cases for the recovery day sleep in the experimental group, or whether they code an effect size for the group that was sleep deprived for 5 days and then got 10 hours of sleep on the recovery day.
I’m not sure why that’s relevant to my question? They still did 5-6 days (depending on whether you count the recovery day, on which many SR subjects got even less sleep than before) of sleep restriction in total. Unless Lowe is only counting the results from the first day of sleep restriction, which is possible but seems unlikely, describing this as 1 day of cumulative sleep restriction duration seems inaccurate. However, I will withhold judgment until I hear back from Lowe.
Huh. I had assumed they might have been only including the first day, but you’re right that that’s unlikely. Probably a typo.
That wouldn’t change their overall meta-analytic effect sizes, though, since they aggregate across different durations of sleep restriction when calculating it.
Dr. Lowe did get back to me briefly to say she’s looking into it. I’ll post an update when I hear back.
If it was indeed a typo (there is at least one more in the same table—Saleh (2003) is duplicated when there should be one entry for 2003 and one for Saleh 2011). On the other hand, it’s possible it was miscoded or misinterpreted. I’d be surprised if that were the case, but it’s hard to see, for example, how they came up with a number for “mean hours of sleep deprivation” given the 6 different cases for the recovery day sleep in the experimental group, or whether they code an effect size for the group that was sleep deprived for 5 days and then got 10 hours of sleep on the recovery day.