condition	mean	min	max
4 h after light	6.377046666666667	6.20585	6.53911
8 h after light	6.530853333333333	6.48084	6.56705
12 h after light	6.402856666666667	6.34564	6.5107
4 h after dark	6.73637	6.627000000000001	6.82367
8 h after dark	6.34082	6.14915	6.55472
12 h after dark	6.64784	6.57672	6.78415