condition	mean	min	max
4 h after light	6.296013333333334	6.11998	6.505380000000001
8 h after light	6.47339	6.29119	6.70397
12 h after light	6.538836666666667	6.30273	6.802989999999999
4 h after dark	6.506516666666667	6.29939	6.751710000000001
8 h after dark	6.51664	6.38784	6.68624
12 h after dark	6.39197	6.14639	6.79735