condition mean min max ZT0-3 4.79884 4.239145000000001 5.358535 ZT4-7 3.22602 3.22602 3.22602 ZT8-11 2.999075 2.999075 2.999075 ZT12-15 0 0 0 ZT16-19 4.31216 4.31216 4.31216 ZT20-23 3.438215 3.438215 3.438215