condition	mean	min	max
4 h after light	17.4369	16.5547	18.3191
8 h after light	21.13275	20.6543	21.6112
12 h after light	17.88345	17.5388	18.2281
4 h after dark	22.4067	21.6995	23.1139
8 h after dark	19.33965	18.6369	20.0424
12 h after dark	18.67435	17.9446	19.4041