condition mean min max ZT0-3 11.725005 9.323765 13.823699999999999 ZT4-7 10.779399999999999 10.779399999999999 10.779399999999999 ZT8-11 9.791889999999999 9.791889999999999 9.791889999999999 ZT12-15 20.74825 18.47315 23.02335 ZT16-19 16.166249999999998 16.166249999999998 16.166249999999998 ZT20-23 16.41175 16.41175 16.41175