condition mean min max ZT0-3 22.817050000000002 22.817050000000002 22.817050000000002 ZT4-7 16.24555 16.24555 16.24555 ZT8-11 11.8788 11.8788 11.8788 ZT12-15 10.091484999999999 10.091484999999999 10.091484999999999 ZT16-19 20.17755 20.17755 20.17755 ZT20-23 19.3538 19.3538 19.3538