condition	mean	min	max
4 h after light	6.8462966666666665	6.63415	7.0944199999999995
8 h after light	6.743053333333334	6.53217	7.05238
12 h after light	6.50509	6.28656	6.72262
4 h after dark	6.713473333333334	6.4181099999999995	6.9646300000000005
8 h after dark	6.655633333333333	6.50697	6.920310000000001
12 h after dark	6.73501	6.52715	7.08277