condition mean min max ZT0-3 37.2716 37.2716 37.2716 ZT4-7 28.24455 28.24455 28.24455 ZT8-11 41.6964 41.6964 41.6964 ZT12-15 34.9617 34.9617 34.9617 ZT16-19 51.5841 51.5841 51.5841 ZT20-23 27.15835 27.15835 27.15835