condition mean min max ZT0-3 0.0312628115 0.0 0.062525623 ZT4-7 1.0804116019999999 0.9513184225 1.2095047815 ZT8-11 15.276065898999999 8.515771798 22.03636 ZT12-15 63.789020074999996 62.128245555 65.449794595 ZT16-19 39.238533395000005 36.478691855 41.998374935 ZT20-23 33.4893392825 30.141477515 36.837201050000004