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Table 6 Correlation coefficients between the WASO and REM/SWS/stage 1/stage 2, for the total of the night, 1st/3rd and 3rd/3 thirds of the night

From: Similar polysomnographic pattern in primary insomnia and major depression with objective insomnia: a sign of common pathophysiology?

Group insomnia Group depression
Total night 1st third 3rd third Total night 1st third 3rd third
  % WASO   % WASO REML   % WASO   % WASO   % WASO REML   % WASO
% REM −0.500 % REM −0.497 −0.397 % REM −0.607 % REM −0.577 %REM −0.631 −0.468 % REM −0.594
% SWS −0.396 %SWS −0.370 / % SWS −0.335 % SWS −0.297 % SWS −0.447 / % SWS −0.377
% stage 2 −0.511 % stage 2 −0.669 / % stage 2 −0.657 % stage 2 −0.506 % stage 2 −0.726 / % stage 2 −0.683
% stage1 NS % stage1 NS / % stage 1 NS % stage 1 NS % stage 1 −0.310 / % stage 1 NS
  1. All correlations were significant at p < 0.005
  2. REM Rapid eye movement sleep, SWS slow-wave sleep, WASO wake after sleep onset