condition mean min max ZT0-3 7.9269300000000005 7.9269300000000005 7.9269300000000005 ZT4-7 6.540649999999999 6.540649999999999 6.540649999999999 ZT8-11 4.250249999999999 4.250249999999999 4.250249999999999 ZT12-15 4.39302 4.39302 4.39302 ZT16-19 5.44473 5.44473 5.44473 ZT20-23 7.437126666666666 7.437126666666666 7.437126666666666