condition	mean	min	max
4 h after light	6.717053333333333	6.67017	6.74216
8 h after light	6.68982	6.61498	6.7273
12 h after light	6.632029999999999	6.5263599999999995	6.776039999999999
4 h after dark	6.711133333333334	6.45782	7.02827
8 h after dark	6.736323333333333	6.45621	7.0019100000000005
12 h after dark	6.79537	6.59594	7.020910000000001