condition	mean	min	max
4 h after light	6.93051	6.806760000000001	7.11665
8 h after light	6.940026666666666	6.69539	7.34047
12 h after light	6.8090166666666665	6.62944	7.025989999999999
4 h after dark	6.770969999999999	6.593319999999999	6.981389999999999
8 h after dark	6.872606666666666	6.60199	7.1135399999999995
12 h after dark	6.93145	6.85653	6.985339999999999