condition	mean	min	max
4 h after light	6.686623333333333	6.23998	6.9769
8 h after light	6.84358	6.66277	7.0511800000000004
12 h after light	6.856863333333333	6.5426400000000005	7.17035
4 h after dark	6.480976666666667	6.1485199999999995	6.825480000000001
8 h after dark	6.57781	6.42889	6.669110000000001
12 h after dark	6.71679	6.66281	6.80742