condition mean min max ZT0-3 3285.817771 3285.817771 3285.817771 ZT4-7 3541.8191295 3541.8191295 3541.8191295 ZT8-11 4281.7975135 4281.7975135 4281.7975135 ZT12-15 4028.9937775 4028.9937775 4028.9937775 ZT16-19 3594.7091145 3594.7091145 3594.7091145 ZT20-23 3828.500223 3828.500223 3828.500223