condition	mean	min	max
4 h after light	8.71477	8.566239999999999	9.00175
8 h after light	8.285193333333334	8.24825	8.33853
12 h after light	8.315533333333335	8.17619	8.566410000000001
4 h after dark	8.212226666666666	8.083269999999999	8.288269999999999
8 h after dark	8.312753333333333	8.26882	8.380230000000001
12 h after dark	8.37934	8.26267	8.52956