condition mean min max ZT0-3 22.425633333333334 14.002500000000001 27.1943 ZT4-7 14.04375 14.04375 14.04375 ZT8-11 13.84085 13.84085 13.84085 ZT12-15 16.2757 16.05105 16.50035 ZT16-19 18.240000000000002 18.240000000000002 18.240000000000002 ZT20-23 27.1784 27.1784 27.1784