condition mean min max ZT0-3 74.083046 74.083046 74.083046 ZT4-7 32.683760500000005 32.683760500000005 32.683760500000005 ZT8-11 55.2337685 55.2337685 55.2337685 ZT12-15 76.2464715 76.2464715 76.2464715 ZT16-19 162.026946 162.026946 162.026946 ZT20-23 165.7325185 165.7325185 165.7325185