condition mean min max ZT0-3 11.68205 11.2744 12.0897 ZT4-7 6.334515 6.334515 6.334515 ZT8-11 4.0646450000000005 4.0646450000000005 4.0646450000000005 ZT12-15 0 0 0 ZT16-19 7.54078 7.54078 7.54078 ZT20-23 10.48845 10.48845 10.48845