condition	mean	min	max
4 h after light	6.469123333333333	6.37941	6.5621
8 h after light	6.13596	6.01347	6.22706
12 h after light	6.166433333333334	5.88984	6.3653900000000005
4 h after dark	6.13546	5.8827300000000005	6.26415
8 h after dark	6.147433333333334	5.9943800000000005	6.24403
12 h after dark	6.195633333333333	6.08882	6.331230000000001