condition	mean	min	max
4 h after light	6.788736666666666	6.636889999999999	6.95298
8 h after light	6.640736666666667	6.3221300000000005	6.850110000000001
12 h after light	6.774970000000001	6.3747	7.0149300000000006
4 h after dark	6.8197399999999995	6.6067	7.026269999999999
8 h after dark	6.76631	6.56177	6.977689999999999
12 h after dark	6.66763	6.62292	6.74487