condition	mean	min	max
4 h after light	18.9480905	18.498751	19.39743
8 h after light	17.3589875	13.615643	21.102332
12 h after light	18.0587715	16.391606	19.725937
4 h after dark	17.489063	16.623927	18.354199
8 h after dark	18.7153955	18.632833	18.797958
12 h after dark	19.966779	19.966779	19.966779