condition mean min max ZT0-3 10.373861 10.373861 10.373861 ZT4-7 10.631600500000001 10.631600500000001 10.631600500000001 ZT8-11 11.859841 11.859841 11.859841 ZT12-15 10.668912500000001 10.668912500000001 10.668912500000001 ZT16-19 10.633149 10.633149 10.633149 ZT20-23 10.835553 10.835553 10.835553