Seasonality in mood disorders: Probing association of accelerometer-derived physical activity with daylength and solar insolation.

However, this interaction term did not reach statistical significance (p>0.05) for the partial dataset (N = 574) that only included subject-days with solar insolation not exceeding the maximum value ( 101 . 6 W/cm 2 /day ) for control subset ( Fig 3 , Table 2 ).

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