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Table 4 Logistic regression analyses on associated risk for the existence both of circadian rhythm sleep disorder and insomnia

From: Prevalence and associated factors of circadian rhythm sleep-wake disorders and insomnia among visually impaired Japanese individuals

   Possible circadian rhythm sleep-wake disorders (n = 52)   Possible insomnia (n = 45)
  Crude Adjusted   Crude Adjusted
n=112a OR 95% CI P OR 95% CI P n=105b OR 95% CI P OR 95% CI P
Age    1.02 0.99 - 1.05 0.06      1.00 0.98 - 1.03 0.82    
Gender Female 22/47 1.00       15/39 1.00      
Male 30/66 0.89 0.45 - 2.01 0.95     30/66 1.33 0.60 - 2.99 0.49    
Visual status VI 9/38 1.00       23/50 1.00      
BL 43/75 4.33 1.80 - 10.41 <0.01     22/55 0.78 0.36 - 1.70 0.54    
Light perception with 14/54 1.00    1.00    27/66 1.00      
without 38/59 5.17 2.30 - 11.61 <0.01 8.61 3.01 - 24.66 <0.01 18/39 1.24 0.56 - 2.75 0.60    
Social status Employed/student 35/85 1.00    1.00    32/80 1.00      
Unemployed 17/28 2.21 0.92 - 5.29 0.08 5.68 1.72 - 18.78 <0.01 13/25 1.63 0.66 - 4.01 0.29    
Living alone No 36/89 1.00    1.00    33/84 1.00      
Yes 16/24 2.94 1.14 - 7.60 0.03 3.57 1.17 - 10.88 0.03 12/21 2.06 0.78 - 5.43 0.14    
Disease currently treated No 13/47 1.00       20/52 1.00      
Yes 39/66 3.78 1.69 - 8.46 <0.01     25/53 1.43 0.66 - 3.11 0.37    
Exercise habits Yes 25/64 1.00       31/68 1.00      
No 27/49 1.92 0.90 - 4.07 0.09     14/37 0.73 0.32 - 1.65 0.44    
Use of hypnotics No 35/91 1.00    1.00    34/88 1.00    1.00   
Yes 17/22 5.44 1.84 - 16.07 <0.01 7.33 2.00 - 26.90 <0.01 11/17 2.91 0.99 - 8.60 0.05 2.91 0.99 - 8.60 0.05
  1. OR odds ratio, CI confidence interval, VI visual impairment, BL blindness
  2. aThe numerator indicates the number of visually impaired individuals with possible CRSWD (n = 52), and the denominator indicates the total number of individuals with possible CRSWD and those who had neither CRSWD nor insomnia symptoms (n = 60). bThe numerator represents the number of visually impaired individuals with possible insomnia (n = 45), and the denominator presents the total number of individuals with insomnia and those who had neither CRSWD nor insomnia symptoms (n = 60)
  3. In the logistic regression models, those without both possible CRSWD and possible insomnia (n = 60) were classified as controls