condition mean min max ZT0-3 10.066465 10.066465 10.066465 ZT4-7 10.3955205 10.3955205 10.3955205 ZT8-11 9.949443500000001 9.949443500000001 9.949443500000001 ZT12-15 8.7767635 8.7767635 8.7767635 ZT16-19 9.619208 9.619208 9.619208 ZT20-23 10.975096 10.975096 10.975096