condition mean min max ZT0-3 1880.95 1880.95 1880.95 ZT4-7 1758.7 1758.7 1758.7 ZT8-11 1859.6 1859.6 1859.6 ZT12-15 1827.15 1827.15 1827.15 ZT16-19 1777.9 1777.9 1777.9 ZT20-23 1952.05 1952.05 1952.05