condition mean min max ZT0-3 16.384149999999998 16.384149999999998 16.384149999999998 ZT4-7 15.296700000000001 15.296700000000001 15.296700000000001 ZT8-11 7.837165000000001 7.837165000000001 7.837165000000001 ZT12-15 7.877485 7.877485 7.877485 ZT16-19 11.33415 11.33415 11.33415 ZT20-23 17.5527 17.5527 17.5527