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. Author manuscript; available in PMC: 2009 May 16.
Published in final edited form as: Behav Brain Res. 2008 Jan 4;189(1):41–51. doi: 10.1016/j.bbr.2007.12.019

Figure 9. Spearman Rank Order correlations between REM sleep duration and NREM sleep duration across development.

Figure 9

Data represent linear regressions and corresponding Spearman r values between REM sleep duration and subsequent NREM sleep duration (in minutes) from P30–P50 in developing 33 kits, the adult ferret (AD) and P30–32 cats (K31). There were significant positive correlations at all ages in the ferret and in P30–32 cats (H). All other correlations between NREM sleep and REM sleep duration (or with wakefulness) were not significant.