Table 3 Risk of incident dementia below and above the change point of sunlight exposure (continuous variable)
Time spent in outdoor light | 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 | reference |  | reference |  | reference |  |
 below 1.5 hours (per 0.5 hour) | 1.353 (1.199-1.528) | <0.001 | 1.261 (1.084-1.468) | 0.003 | 1.287 (1.094-1.515) | 0.002 |
 above 1.5 hours (per 0.5 hour) | 1.071 (1.044-1.099) | <0.001 | 1.069 (1.033-1.105) | <0.001 | 1.070 (1.031-1.110) | <0.001 |
Summer | ||||||
 2 hours | reference |  | reference |  | reference |  |
 below 2 hours (per 1 hour) | 1.232 (1.137-1.336) | <0.001 | 1.180 (1.065-1.308) | 0.002 | 1.193 (1.069-1.331) | 0.002 |
 above 2 hours (per 1 hour) | 1.032 (1.013-1.051) | 0.001 | 1.029 (1.005-1.053) | 0.019 | 1.026 (1.000-1.052) | 0.048 |
Winter | ||||||
 1 hours | reference |  | reference |  | reference |  |
 below 1 hours (per 1 hour) | 1.182 (1.071-1.305) | 0.001 | 1.173 (1.038-1.326) | 0.010 | 1.184 (1.039-1.349) | 0.011 |
 above 1 hours (per 1 hour) | 1.099 (1.071-1.127) | <0.001 | 1.104 (1.066-1.142) | <0.001 | 1.106 (1.066-1.148) | <0.001 |