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