condition	mean	min	max
4 h after light	6.774013333333333	6.72214	6.8559
8 h after light	6.779096666666666	6.650919999999999	6.8962699999999995
12 h after light	6.90041	6.618010000000001	7.0525
4 h after dark	6.89662	6.83937	6.93421
8 h after dark	6.921736666666667	6.65792	7.3292399999999995
12 h after dark	6.812356666666666	6.633789999999999	6.97433