condition mean min max 4 h after light 1.36599 1.23654 1.49544 8 h after light 1.51139 1.35224 1.67054 12 h after light 2.093955 1.83848 2.34943 4 h after dark 2.43533 2.12714 2.74352 8 h after dark 1.613185 1.61054 1.61583 12 h after dark 1.643935 1.64358 1.64429