condition mean min max ZT0-3 557.463889 557.463889 557.463889 ZT4-7 454.7125125 454.7125125 454.7125125 ZT8-11 342.32474049999996 342.32474049999996 342.32474049999996 ZT12-15 437.7924895 437.7924895 437.7924895 ZT16-19 332.729768 332.729768 332.729768 ZT20-23 260.095268 260.095268 260.095268