condition mean min max ZT0-3 5.229620000000001 4.710905 5.748335 ZT4-7 3.724775 3.724775 3.724775 ZT8-11 3.8279050000000003 3.8279050000000003 3.8279050000000003 ZT12-15 0 0 0 ZT16-19 4.06844 4.06844 4.06844 ZT20-23 3.20818 3.20818 3.20818