condition	mean	min	max
4 h after light	20.568591	16.902505	24.234677
8 h after light	15.8935185	15.171298	16.615739
12 h after light	18.3580565	16.0266	20.689513
4 h after dark	16.3550255	14.153638	18.556413
8 h after dark	17.7009805	12.77359	22.628371
12 h after dark	16.479485	16.479485	16.479485