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Table 2 Sample Characteristics

From: Mapping of the Insomnia Severity Index and other sleep measures to EuroQol EQ-5D health state utilities

  Number % Mean Age (SD) (Years) Mean (SD)
EQ-5D
Mean Duration (SD) (Hours) Mean ISI
(SD)
Whole sample 2,842 100 42.9 (15.7) 0.765 (0.2) 7.8 (1.9) 14.1 (4.8)
Age group       
   18-29 743 26.1 24.2 (3.8) 0.784 (0.2) 8.0 (1.9) 13.4 (4.6)
   30-39 569 20.0 34.7 (2.9) 0.754 (0.2) 7.7 (1.9) 15.0 (5.0)
   40-49 624 22.0 45.0 (2.8) 0.754 (0.2) 7.5 (1.8) 15.0 (4.7)
   50-59 405 14.3 54.9 (2.8) 0.749 (0.2) 7.5 (1.8) 14.2 (4.7)
   60-69 351 12.4 64.2 (2.9) 0.770 (0.2) 7.9 (1.9) 12.9 (4.5)
   ≥ 70 150 5.30 74.8 (4.6) 0.786 (0.1) 8.1 (1.6) 12.3 (4.7)
Gender       
   Female 1,834 64.50 42.0 (15.9) 0.766 (0.2) 7.9 (1.9) 14.3 (4.8)
   Male 1,008 35.50 44.5 (15.2) 0.762 (0.2) 7.5 (1.8) 13.7 (4.7)
Race       
   White 2,318 83.7 44.0 (15.7) 0.768 (0.2) 7.8 (1.8) 13.9 (4.7)
   Black 292 10.5 38.1 (14.7) 0.755 (0.2) 7.4 (2.1) 14.7 (5.1)
   Asian 44 1.60 26.7 (10.4) 0.805 (0.1) 7.4 (2.1) 13.7 (3.7)
   Other 116 4.20 38.3 (13.7) 0.719 (0.2) 7.5 (2.1) 15.7 (5.3)
Comorbidity       
   No 1068 37.60 38.2 (14.4) 0.835 (0.1) 7.7 (1.8) 12.7 (4.3)
   Yes 1774 62.40 45.7 (15.8) 0.723 (0.2) 7.8 (1.9) 14.9 (4.9)
Sleep quality       
   0 146 5.14 43.6 (13.4) 0.614 (0.2) 6.6 (2.5) 20.5 (5.1)
   1 94 3.31 43.7 (15.7) 0.697 (0.2) 7.2 (2.3) 18.3 (4.8)
   2 250 8.81 43.9 (14.2) 0.712 (0.2) 7.4 (2.2) 17.1 (4.6)
   3 457 16.10 44.0 (15.0) 0.755 (0.2) 7.7 (1.9) 15.5 (4.1)
   4 457 16.10 41.6 (14.8) 0.763 (0.2) 7.9 (1.8) 13.9 (4.0)
   5 559 19.70 43.3 (15.7) 0.795 (0.1) 7.8 (1.6) 12.9 (3.9)
   6 411 14.48 40.9 (16.8) 0.800 (0.1) 8.0 (1.6) 12.2 (3.7)
   7 291 10.25 42.7 (17.0) 0.804 (0.2) 8.0 (1.7) 11.6 (4.1)
   8 108 3.81 43.8 (17.8) 0.781 (0.2) 8.4 (1.8) 10.9 (4.0)
   9 35 1.23 40.5 (18.3) 0.858 (0.2) 8.5 (1.2) 11.7 (5.2)
   10 30 1.06 48.3 (17.6) 0.727 (0.3) 8.0 (2.2) 10.5 (5.7)
Next day sleepiness       
   0 162 5.71 54.0 (15.8) 0.764 (0.2) 7.8 (2.0) 12.4 (5.4)
   1 100 3.52 49.3 (16.6) 0.805 (0.2) 8.0 (2.0) 12.2 (4.5)
   2 157 5.53 45.0 (16.9) 0.792 (0.2) 7.9 (1.8) 12.5 (4.0)
   3 213 7.51 46.0 (16.0) 0.788 (0.2) 7.8 (1.7) 12.4 (4.1)
   4 236 8.32 44.6 (16.1) 0.776 (0.2) 7.8 (1.8) 13.0 (4.1)
   5 373 13.15 44.4 (15.6) 0.781 (0.2) 7.9 (1.8) 13.5 (4.3)
   6 436 15.37 40.9 (15.4) 0.783 (0.2) 7.8 (1.9) 13.5 (4.2)
   7 520 18.33 40.6 (14.2) 0.758 (0.2) 7.8 (1.8) 14.7 (4.6)
   8 364 12.83 38.4 (14.3) 0.747 (0.2) 7.7 (1.9) 15.6 (4.8)
   9 135 4.76 40.5 (13.7) 0.683 (0.2) 7.5 (2.1) 16.2 (5.3)
   10 141 4.97 39.2 (14.0) 0.710 (0.2) 7.2 (2.2) 18.1 (5.5)
Latency (minutes)       
   < 15 443 17.39 44.2 (15.2) 0.808 (0.1) 7.7 (1.7) 11.9 (4.3)
   15-30 468 18.37 44.7 (16.5) 0.799 (0.2) 7.8 (1.7) 12.3 (4.1)
   30-45 449 17.62 42.9 (16.0) 0.791 (0.1) 7.8 (1.7) 13.5 (4.3)
   45-60 205 8.05 41.8 (15.0) 0.773 (0.2) 7.6 (1.7) 13.9 (4.3)
   60-90 404 15.86 42.3 (15.1) 0.752 (0.2) 7.8 (1.8) 14.6 (4.4)
   > = 90 579 22.72 40.5 (15.9) 0.729 (0.2) 8.0 (2.1) 15.9 (4.7)
Wake up times       
   1 375 18.20 43.6 (15.4) 0.802 (0.2) 7.5 (1.7) 12.8 (4.3)
   2 732 35.6 44.5 (16.1) 0.780 (0.2) 7.7 (1.7) 13.6 (4.5)
   3 588 28.6 44.1 (15.6) 0.759 (0.2) 8.0 (1.8) 14.3 (4.4)
   4 184 8.90 44.9 (15.2) 0.743 (0.2) 8.3 (1.8) 15.6 (4.7)
   5 179 8.70 42.6 (13.0) 0.715 (0.2) 8.4 (1.8) 16.2 (4.6)