condition mean min max ZT0-3 5.283953333333334 4.63846 6.1761800000000004 ZT4-7 5.0012799999999995 5.0012799999999995 5.0012799999999995 ZT8-11 8.863525 8.863525 8.863525 ZT12-15 25.114625 24.32735 25.9019 ZT16-19 13.11115 13.11115 13.11115 ZT20-23 10.337435 10.337435 10.337435