condition mean min max ZT0-3 2.89877 2.89877 2.89877 ZT4-7 2.32572 2.32572 2.32572 ZT8-11 2.6443950000000003 2.6443950000000003 2.6443950000000003 ZT12-15 3.832 3.832 3.832 ZT16-19 4.59289 4.59289 4.59289 ZT20-23 2.82776 2.82776 2.82776