condition mean min max ZT0-3 18.07995 18.07995 18.07995 ZT4-7 11.831199999999999 11.831199999999999 11.831199999999999 ZT8-11 11.30655 11.30655 11.30655 ZT12-15 14.569099999999999 14.569099999999999 14.569099999999999 ZT16-19 22.8932 22.8932 22.8932 ZT20-23 21.00775 21.00775 21.00775