condition mean min max ZT0-3 9.684407499999999 9.060155 10.30866 ZT4-7 11.15145 11.15145 11.15145 ZT8-11 18.71285 18.71285 18.71285 ZT12-15 0 0 0 ZT16-19 18.88865 18.88865 18.88865 ZT20-23 13.6768 13.6768 13.6768