Exposure† | Unadjusted‡ | Adjusted for mean hours of sunlight/day§ | Adjusted for change in mean hours of sunlight/day compared to previous month¶ |
---|---|---|---|
January | 0.95 (0.89 to 1.03) | 0.93 (0.84 to 1.03)++ | 0.96 (0.89 to 1.03) |
February | 0.97 (0.90 to 1.04) | 0.95 (0.86 to 1.04) | 0.96 (0.89 to 1.04) |
March | 1.04 (0.97 to 1.12) | 1.02 (0.94 to 1.11) | 1.03 (0.96 to 1.11) |
April | 1.11 (1.03 to 1.19)** | 1.10 (1.02 to 1.19)* | 1.10 (1.02 to 1.19)* |
May | 1.17 (1.08 to 1.25)*** | 1.16 (1.08 to 1.25)*** | 1.15 (1.07 to 1.24)*** |
June | 1.07 (0.99 to 1.15)+ | 1.07 (0.99 to 1.15)+ | 1.06 (0.99 to 1.15)++ |
July (reference) | 1 | 1 | 1 |
August | 1.08 (1.00 to 1.16)* | 1.07 (1.00 to 1.16)+ | 1.08 (1.00 to 1.16)* |
September | 1.00 (0.93 to 1.08) | 0.99 (0.91 to 1.07) | 1.01 (0.93 to 1.09) |
October | 0.98 (0.91 to 1.05) | 0.96 (0.87 to 1.05) | 0.99 (0.91 to 1.06) |
November | 0.96 (0.89 to 1.03) | 0.93 (0.84 to 1.03)++ | 0.97 (0.90 to 1.04) |
December | 0.88 (0.82 to 0.95)*** | 0.85 (0.77 to 0.95)** | 0.88 (0.82 to 0.95)*** |
+p<0.10, ++p<0.20, *p<0.05, **p<0.01, ***p<0.001.
†Data from Australia were recoded to align with Greece and Norway (eg, January became July, February became August, and so on).
‡p Value<0.001 for testing if all month variables could be removed without impacting the model (likelihood ratio test of cohort+year+sex+month vs cohort+year+sex).
§p Value <0.001 for testing if all month variables could be removed without impacting the model (likelihood ratio test of cohort+year+sex+sun+month vs cohort+year+sex+sun).
¶p Value <0.001 for testing if all month variables could be removed without impacting the model (likelihood ratio test of cohort+year+sex+sun change+month vs cohort+year+sex+sun change).