condition mean min max ZT0-3 51.414530325 21.00254004 81.82652061 ZT4-7 229.40482762500002 194.62904120000002 264.18061405000003 ZT8-11 200.16127995 179.2593933 221.06316660000002 ZT12-15 175.10012032499998 169.6410963 180.55914435 ZT16-19 128.311355075 125.19002325 131.4326869 ZT20-23 106.68930186 100.01832662 113.36027709999999