condition mean min max ZT0-3 0.8894839999999999 0.8894839999999999 0.8894839999999999 ZT4-7 0.40522 0.40522 0.40522 ZT8-11 0.7146254999999999 0.7146254999999999 0.7146254999999999 ZT12-15 0.6556355 0.6556355 0.6556355 ZT16-19 1.1357650000000001 1.1357650000000001 1.1357650000000001 ZT20-23 1.226475 1.226475 1.226475