condition mean min max ZT0-3 2.1212 2.1212 2.1212 ZT4-7 0.54495 0.54495 0.54495 ZT8-11 0.444966 0.444966 0.444966 ZT12-15 0.543445 0.543445 0.543445 ZT16-19 1.906853 1.906853 1.906853 ZT20-23 4.739715 4.739715 4.739715