condition mean min max ZT0-3 9.122445 9.122445 9.122445 ZT4-7 9.1936635 9.1936635 9.1936635 ZT8-11 8.6628615 8.6628615 8.6628615 ZT12-15 9.18648 9.18648 9.18648 ZT16-19 9.9881285 9.9881285 9.9881285 ZT20-23 9.8363805 9.8363805 9.8363805