condition mean min max ZT0-3 3.0948200000000003 3.0948200000000003 3.0948200000000003 ZT4-7 1.37703 1.37703 1.37703 ZT8-11 2.166225 2.166225 2.166225 ZT12-15 1.73868 1.73868 1.73868 ZT16-19 3.09648 3.09648 3.09648 ZT20-23 2.92223 2.92223 2.92223