condition mean min max ZT0-3 13.403625000000002 12.7078 14.099450000000001 ZT4-7 15.315 15.315 15.315 ZT8-11 15.64845 15.64845 15.64845 ZT12-15 0 0 0 ZT16-19 12.2333 12.2333 12.2333 ZT20-23 13.67945 13.67945 13.67945