condition	mean	min	max
4 h after light	18.50475	17.0082	20.0013
8 h after light	15.43845	14.9747	15.9022
12 h after light	15.98675	15.2491	16.7244
4 h after dark	18.19035	16.5632	19.8175
8 h after dark	18.092	17.7389	18.4451
12 h after dark	20.5181	20.1933	20.8429