condition	mean	min	max
4 h after light	6.447333333333333	6.36798	6.59025
8 h after light	6.100726666666667	5.90281	6.294169999999999
12 h after light	6.16066	5.98045	6.50371
4 h after dark	6.12634	5.70559	6.48451
8 h after dark	6.51295	6.33127	6.63289
12 h after dark	6.37333	6.13727	6.65124