condition mean min max ZT0-3 9.612689999999999 8.92701 10.298369999999998 ZT4-7 12.2351 12.2351 12.2351 ZT8-11 7.7924299999999995 7.7924299999999995 7.7924299999999995 ZT12-15 0 0 0 ZT16-19 8.366185 8.366185 8.366185 ZT20-23 9.829215 9.829215 9.829215