condition mean min max ZT0-3 361.2654060666666 172.6553245 549.8754876333333 ZT4-7 301.70408610000004 250.92248270000002 352.48568950000003 ZT8-11 298.76730408333333 240.34744999999998 357.1871581666667 ZT12-15 1057.2377328500002 959.8843976 1154.5910681 ZT16-19 620.0020954 522.7966319 717.2075589000001 ZT20-23 574.0663919499999 380.3734047666666 767.7593791333333