condition mean min max ZT0-3 15.174 15.174 15.174 ZT4-7 8.65522 8.65522 8.65522 ZT8-11 11.629349999999999 11.629349999999999 11.629349999999999 ZT12-15 18.858649999999997 18.858649999999997 18.858649999999997 ZT16-19 18.73155 18.73155 18.73155 ZT20-23 17.806150000000002 17.806150000000002 17.806150000000002