condition mean min max 4 h after light 5.3193166666666665 5.30314 5.34386 8 h after light 5.42045 5.25819 5.71709 12 h after light 5.479336666666667 5.18546 5.84497 4 h after dark 5.37808 5.1018099999999995 5.77405 8 h after dark 5.4262733333333335 5.16557 5.7855099999999995 12 h after dark 5.33218 5.13223 5.66028