condition mean min max 4 h after light 1.86151 1.61971 2.10331 8 h after light 1.3415 1.22192 1.46108 12 h after light 1.35495 1.34742 1.36248 4 h after dark 1.5783166666666666 1.36313 1.79307 8 h after dark 1.6189633333333333 1.47095 1.71557 12 h after dark 1.46518 1.14715 1.96087