condition mean min max ZT0-3 109.97915 76.0783 143.88 ZT4-7 184.21949999999998 184.21949999999998 184.21949999999998 ZT8-11 215.8225 215.8225 215.8225 ZT12-15 0 0 0 ZT16-19 230.017 230.017 230.017 ZT20-23 171.87 171.87 171.87