condition mean min max ZT0-3 21.048499999999997 17.224 24.872999999999998 ZT4-7 9.024465 9.024465 9.024465 ZT8-11 12.855049999999999 12.855049999999999 12.855049999999999 ZT12-15 0 0 0 ZT16-19 19.5048 19.5048 19.5048 ZT20-23 12.04805 12.04805 12.04805