condition mean min max ZT0-3 71.2538 70.42265 72.08494999999999 ZT4-7 68.1846 68.1846 68.1846 ZT8-11 33.50835 33.50835 33.50835 ZT12-15 0 0 0 ZT16-19 49.0513 49.0513 49.0513 ZT20-23 72.46260000000001 72.46260000000001 72.46260000000001