condition	mean	min	max
4 h after light	6.4262266666666665	6.26279	6.60601
8 h after light	6.34235	6.10269	6.73442
12 h after light	6.1330599999999995	6.07057	6.2247699999999995
4 h after dark	6.138356666666667	5.9881	6.39128
8 h after dark	6.372763333333333	6.26006	6.57808
12 h after dark	6.343443333333334	6.23717	6.550730000000001