condition mean min max ZT0-3 14.19875 14.19875 14.19875 ZT4-7 10.952645 10.952645 10.952645 ZT8-11 11.9746 11.9746 11.9746 ZT12-15 10.37805 10.37805 10.37805 ZT16-19 18.368949999999998 18.368949999999998 18.368949999999998 ZT20-23 17.306800000000003 17.306800000000003 17.306800000000003