condition mean min max ZT0-3 0.03422285 0.03422285 0.03422285 ZT4-7 0.043206 0.043206 0.043206 ZT8-11 0.12379100000000001 0.12379100000000001 0.12379100000000001 ZT12-15 0.02154325 0.02154325 0.02154325 ZT16-19 0.07586375000000001 0.07586375000000001 0.07586375000000001 ZT20-23 0.0188723 0.0188723 0.0188723