condition mean min max ZT0-3 11.930683333333334 10.743 13.0912 ZT4-7 10.99025 10.99025 10.99025 ZT8-11 10.948715 10.948715 10.948715 ZT12-15 16.004575 15.92445 16.084699999999998 ZT16-19 13.03905 13.03905 13.03905 ZT20-23 14.45795 14.45795 14.45795