condition mean min max ZT0-3 46.02056666666666 41.460499999999996 53.984899999999996 ZT4-7 36.419 36.419 36.419 ZT8-11 44.87415 44.87415 44.87415 ZT12-15 98.97865 87.6123 110.345 ZT16-19 76.62219999999999 76.62219999999999 76.62219999999999 ZT20-23 71.36575 71.36575 71.36575