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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: J Am Soc Hypertens. 2013 Jul 12;7(6):10.1016/j.jash.2013.06.001. doi: 10.1016/j.jash.2013.06.001

Table 4.

Effects of sleep duration and quality and of daytime activity on systolic blood pressure dip

Parameter Estimate S.E. t P
Sleep duration
  Intercept 26.586 5.098
  Mean sleep time duration −0.505 0.735 −0.69 0.493
  Daily sleep time duration −0.618 0.406 −1.52 0.129
Fragmentation index
  Intercept 22.629 1.688
  Mean fragmentation index −0.033 0.062 −0.53 0.595
  Daily fragmentation index −0.115 0.035 −3.26 0.001
Sleep efficiency
  Intercept −4.575 6.129
  Mean sleep efficiency 0.184 0.093 1.99 0.048
  Daily sleep efficiency 0.092 0.055 1.67 0.096
Daytime activity
  Intercept 15.133 1.894
  Mean activity counts/min 0.003 0.012 0.29 0.775
  Daily activity counts/min 0.009 0.009 1.13 0.261