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Table 1 Univariable comparisons between individuals with BD and HC for demographics, clinical and sleep variables

From: Misperception of sleep in bipolar disorder: an exploratory study using questionnaire versus actigraphy

Variables HC (n = 63) BD (n = 133) P-values
Age (mean) 36.24 (SD 13.54) 45.95 (SD 13.03) .000
Sex (% female) 58.7% (n = 37) 61.7% (n = 82) .695a
BMI 23.48 (SD 3.67) 25.64 (SD 4.51) .001
OSA risk 3.2% (n = 2) 23.3% (n = 31) .000a
Average daily coffee intake 1.31 (SD 1.10) 2.43 (SD 2.30) .000
Average daily alcohol units 1.09 (SD 1.14) 1.00 (SD 1.26) .634
Average daily cigarettes 2.06 (SD 4.12) 5.44 (SD 8.02) .000
MADRS .25 (SD 1.43) 2.29 (SD 3.44) .000
YMRS .07 (SD 0.33) .77 (SD 1.55) .000
TST by PSQI (hours) 7:07 (SD 1:00) 7:26 (SD 1:23) .098
TST by actigraphy (hours) 7:46 (SD 0:43) 8:07 (SD 1:01) .018
SL by PSQI (minutes) 18.83 (SD 16.86) 23.08 (SD 20.34) .152
SL by actigraphy (minutes) 15.37 (SD 19.47) 15.10 (SD 13.43) .910
SE by PSQI (in  %) 90.57 (SD 7.88) 86.58 (SD 12.44) .021
SE by actigraphy (in  %) 84.31 (SD 8.07) 84.13 (SD 6.37) .872
TST misperceptionb 0.86 (SD 0.36) 0.93 (SD 0.42) .202
SL misperceptionb 3.36 (SD 2.05) 3.54 (SD 1.90) .550
SE misperceptionb 2.72 (SD 1.19) 2.95 (SD 1.31) .245
  1. HC healthy controls, BD bipolar disorder, BMI body mass index, OSA risk any positive score related to obstructive sleep apnea on The Berlin Questionnaire, MADRS Montgomery and Asberg Depression Rating Scale, YMRS Young Mania Rating Scale, PSQI Pittsburgh Sleep Quality Index, TST total sleep time, SL sleep latency, SE sleep efficiency
  2. ap values from Chi Square; blog-transformed values given