condition mean min max ZT0-3 22.049175 19.62655 24.4718 ZT4-7 12.367799999999999 12.367799999999999 12.367799999999999 ZT8-11 5.237935 5.237935 5.237935 ZT12-15 0 0 0 ZT16-19 9.988255 9.988255 9.988255 ZT20-23 24.19025 24.19025 24.19025