condition	mean	min	max
4 h after light	6.357763333333334	6.23954	6.45708
8 h after light	6.4094299999999995	6.15194	6.5387699999999995
12 h after light	6.4254999999999995	6.318169999999999	6.53219
4 h after dark	6.4394833333333334	6.41562	6.48002
8 h after dark	6.441493333333334	6.42137	6.475280000000001
12 h after dark	6.41821	6.3618	6.51129