condition mean min max ZT0-3 11630.2 11630.2 11630.2 ZT4-7 20091.3 20091.3 20091.3 ZT8-11 20224.050000000003 20224.050000000003 20224.050000000003 ZT12-15 19576.800000000003 19576.800000000003 19576.800000000003 ZT16-19 19106.45 19106.45 19106.45 ZT20-23 14866.5 14866.5 14866.5