condition	mean	min	max
4 h after light	6.323923333333333	6.07675	6.69308
8 h after light	6.200793333333333	5.98388	6.34685
12 h after light	6.16093	6.1246	6.21399
4 h after dark	6.176753333333333	6.01207	6.36731
8 h after dark	6.21037	5.98635	6.37418
12 h after dark	6.23594	6.04444	6.53874