condition	mean	min	max
4 h after light	6.62508	6.48879	6.87167
8 h after light	6.550363333333333	6.473269999999999	6.663710000000001
12 h after light	6.4269066666666665	6.28454	6.5038800000000005
4 h after dark	6.44581	6.34693	6.57913
8 h after dark	6.386533333333333	6.2626	6.46957
12 h after dark	6.4808	6.23264	6.6048800000000005