condition	mean	min	max
4 h after light	6.58456	6.5451	6.625660000000001
8 h after light	6.72921	6.71064	6.751760000000001
12 h after light	6.77772	6.75281	6.7918899999999995
4 h after dark	6.669286666666667	6.5134300000000005	6.82401
8 h after dark	6.624063333333333	6.40454	6.81193
12 h after dark	6.391583333333333	6.32719	6.45149