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Table 2 Risk of incident dementia below and above the change point of sunlight exposure (categorical variable)

From: Time spent in outdoor light is associated with the risk of dementia: a prospective cohort study of 362094 participants

Time spent in outdoor light Number of incident dementia/Number of participants Model 1
(Age, Sex)
Model 2
(+Education, Skin color, Use of sun/UV Protection, Employment status, Sleep duration, PM2.5)
Model 3
(+Fracture history, Vitamin D supplement, hearing loss, smoking status, alcohol use, CVD, TPA, BMI)
HR (95%CI) P Value HR (95%CI) P Value HR (95%CI) P Value
Average
 1.5 hours 371/49938 reference   reference   reference  
 below 1.5 hours 535/72191 1.199 (1.050-1.369) 0.007 1.176 (1.002-1.380) 0.048 1.184 (1.000-1.401) 0.049
 above 1.5 hours 3243/239965 1.215 (1.091-1.353) <0.001 1.204 (1.056-1.373) 0.006 1.210 (1.054-1.390) 0.007
Summer
 2 hours 657/82473 reference   reference   reference  
 below 2 hours 395/50233 1.213 (1.071-1.375) 0.002 1.163 (0.998-1.354) 0.053 1.182 (1.008-1.387) 0.040
 above 2 hours 3097/229388 1.116 (1.026-1.215) 0.011 1.103 (0.994-1.224) 0.065 1.086 (0.973-1.213) 0.140
Winter
 1 hours 1099/126309 reference   reference   reference  
 below 1 hours 621/73877 1.169 (1.059-1.290) 0.002 1.158 (1.025-1.308) 0.018 1.139 (1.001-1.295) 0.048
 above 1 hours 2429/161908 1.235 (1.150-1.327) <0.001 1.246 (1.139-1.363) <0.001 1.242 (1.129-1.367) <0.001
  1. The results are derived from Cox hazard regression models in three models, with the sunlight exposure as a categorical variable. Bold indicates statistical significance (P value<0.05)
  2. Abbreviation: HR Hazard ratio, CI Confidence interval, CVD Cardiovascular disease, TPA Total physical activity, BMI Body mass index