condition mean min max 0 h after light 4.706445 4.26856 5.14433 4 h after light 6.66746 6.55778 6.77714 8 h after light 7.890295 7.24663 8.53396 4 h after dark 9.463005 7.91031 11.0157 8 h after dark 8.94125 8.72181 9.16069 12 h after dark 6.11702 4.67038 7.56366