condition	mean	min	max
4 h after light	6.75791	6.68998	6.82095
8 h after light	6.826453333333333	6.709280000000001	7.0526100000000005
12 h after light	6.806963333333333	6.763719999999999	6.891089999999999
4 h after dark	6.868833333333334	6.66145	7.11263
8 h after dark	6.726883333333333	6.592410000000001	6.82452
12 h after dark	6.70711	6.57833	6.7750699999999995