condition mean min max ZT0-3 12.85 12.85 12.85 ZT4-7 4.3 4.3 4.3 ZT8-11 5.050000000000001 5.050000000000001 5.050000000000001 ZT12-15 19.4 19.4 19.4 ZT16-19 3.85 3.85 3.85 ZT20-23 12.4 12.4 12.4