condition mean min max 4 h after light 6.295773333333333 5.7428099999999995 6.918819999999999 8 h after light 6.159386666666666 5.65917 6.74177 12 h after light 5.542436666666667 5.1281300000000005 5.95214 4 h after dark 5.884346666666667 5.52217 6.4737800000000005 8 h after dark 6.47187 5.79988 7.68415 12 h after dark 6.59016 6.06732 7.1287