condition mean min max ZT0-3 242.639408 242.639408 242.639408 ZT4-7 466.76210249999997 466.76210249999997 466.76210249999997 ZT8-11 382.932751 382.932751 382.932751 ZT12-15 327.37091699999996 327.37091699999996 327.37091699999996 ZT16-19 231.713265 231.713265 231.713265 ZT20-23 271.9304555 271.9304555 271.9304555