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. 2014 Oct 7;8:762. doi: 10.3389/fnhum.2014.00762

Table 3.

Regressions of cognitive and symptom measures on sleep parameters (spindle density, spindle amplitude, or sleep efficiency) in early course patients.

Group Sleep parameter× group Sleep parameter (pooled data)
t p t p t p
Trails A (s) Spindle density −0.98 0.34 0.78 0.44 −2.02 0.05*
Spindle amplitude −1.34 0.19 1.28 0.21 −0.80 0.43
Sleep efficiency −0.54 0.59 0.62 0.54 0.03 0.98
Trails B (s) Spindle density 0.54 0.60 −0.18 0.86 −5.36 <0.0001*
Spindle amplitude 0.21 0.84 0.11 0.91 −5.22 <0.0001*
Sleep efficiency 0.45 0.66 −0.19 0.84 −2.13 0.04*
WCST perseverative errors Spindle density −0.76 0.46 0.71 0.49 −2.49 0.02*
Spindle amplitude −1.95 0.06 2.02 0.06 −2.06 0.05*
Sleep efficiency 1.28 0.22 −1.22 0.24 −4.70 0.0001*
IQ estimate Spindle density 2.05 0.05* −2.14 0.04* 2.96 0.007*
Spindle amplitude 2.34 0.03* −2.35 0.03* 2.29 0.03*
Sleep efficiency 1.57 0.13 −1.58 0.13 1.39 0.18
WRAT-R Spindle density 1.42 0.17 −1.31 0.21 3.19 0.004*
reading Spindle amplitude 2.85 0.01* −2.77 0.01* 2.09 0.05*
Sleep efficiency 1.54 0.14 −1.52 0.14 1.51 0.14
Block design Spindle density −0.12 0.90 0.13 0.90 1.90 0.07
Spindle amplitude 1.73 0.10 −1.71 0.10 3.12 0.005*
Sleep efficiency 0.64 0.53 −0.69 0.51 2.37 0.03*
CVLT Spindle density −0.06 0.95 −0.20 0.84 0.27 0.79
Spindle amplitude 0.07 0.94 −0.24 0.81 0.85 0.40
Sleep efficiency −0.46 0.65 0.40 0.69 1.84 0.08
SANS Spindle density 0.89 0.38 −0.57 0.58 0.66 0.52
Spindle amplitude −1.27 0.22 1.49 0.15 −0.78 0.44
SAPS Spindle density 0.99 0.33 −0.79 0.44 0.44 0.66
Spindle amplitude −0.81 0.42 1.10 0.28 1.18 0.25
GAF Spindle density −0.68 0.50 0.38 0.71 0.25 0.80
Spindle amplitude 0.32 0.75 −0.60 0.56 0.40 0.69

Group: schizophrenia vs. other psychotic disorders. The Group (x2) and Sleep parameter (x1) x Group columns are based on the following model: y = β0 + β1x1+ β2x2 + β3x1x2. The sleep parameter column is based on the regression using pooled group data without factors for group and its interaction with the sleep parameter (y = β0p + β1px). WCST, Wisconsin Card Sort Test; WRAT-R, Wide Range Achievement Test-Revised; Block Design scaled score; CVLT, California Verbal Learning Test standard score for total immediate word recall; SANS, Scale for the Assessment of Positive Symptoms global total; SAPS, Scales for the Assessment of Positive Symptoms global total; GAF, Global Assessment of Functioning.

*

Significant at p ≤ 0.05.