condition mean min max ZT0-3 352.847441 352.847441 352.847441 ZT4-7 796.1477675 796.1477675 796.1477675 ZT8-11 959.6044405 959.6044405 959.6044405 ZT12-15 636.735562 636.735562 636.735562 ZT16-19 604.7558214999999 604.7558214999999 604.7558214999999 ZT20-23 490.34744150000006 490.34744150000006 490.34744150000006