condition mean min max ZT0-3 881.5 881.5 881.5 ZT4-7 753.9 753.9 753.9 ZT8-11 539.25 539.25 539.25 ZT12-15 692.1 692.1 692.1 ZT16-19 765.35 765.35 765.35 ZT20-23 909.8 909.8 909.8