condition mean min max ZT0-3 12.1254 12.1254 12.1254 ZT4-7 12.254999999999999 12.254999999999999 12.254999999999999 ZT8-11 12.7951 12.7951 12.7951 ZT12-15 10.968515 10.968515 10.968515 ZT16-19 18.3198 18.3198 18.3198 ZT20-23 9.873393333333333 9.873393333333333 9.873393333333333