condition mean min max ZT0-3 9.115475579750001 9.078417981 9.1525331785 ZT4-7 8.339156232 7.686329993999999 8.99198247 ZT8-11 11.193781498249999 9.793704546499999 12.593858449999999 ZT12-15 15.573732855 14.000118465 17.147347245 ZT16-19 21.766829712499998 18.13131885 25.402340575 ZT20-23 35.49917909 30.999186440000003 39.99917174