condition mean min max ZT0-3 29.761316666666666 24.37765 34.7031 ZT4-7 23.3271 23.3271 23.3271 ZT8-11 19.2319 19.2319 19.2319 ZT12-15 39.6198 36.5473 42.6923 ZT16-19 41.402249999999995 41.402249999999995 41.402249999999995 ZT20-23 46.558499999999995 46.558499999999995 46.558499999999995