condition mean min max ZT0-3 5.976475000000001 5.976475000000001 5.976475000000001 ZT4-7 3.2109949999999996 3.2109949999999996 3.2109949999999996 ZT8-11 5.5281649999999996 5.5281649999999996 5.5281649999999996 ZT12-15 7.232855000000001 7.232855000000001 7.232855000000001 ZT16-19 7.731695 7.731695 7.731695 ZT20-23 5.814064999999999 5.814064999999999 5.814064999999999