condition mean min max ZT0-3 100.1060991775 90.889011555 109.3231868 ZT4-7 64.6653681725 62.154777440000004 67.175958905 ZT8-11 68.530801305 58.95954388 78.10205873 ZT12-15 80.260802715 78.473733565 82.04787186499999 ZT16-19 82.0970207325 80.38983104 83.80421042500001 ZT20-23 94.961567545 88.60109177999999 101.32204331