condition mean min max ZT0-3 2.3370616666666666 1.84631 3.04284 ZT4-7 1.0349445 1.0349445 1.0349445 ZT8-11 1.070227 1.070227 1.070227 ZT12-15 3.0491225 2.677305 3.42094 ZT16-19 2.577025 2.577025 2.577025 ZT20-23 4.2153 4.2153 4.2153