condition mean min max ZT0-3 830.95 830.95 830.95 ZT4-7 454.8 454.8 454.8 ZT8-11 752.65 752.65 752.65 ZT12-15 1298.15 1298.15 1298.15 ZT16-19 1434.75 1434.75 1434.75 ZT20-23 998.3 998.3 998.3