condition mean min max ZT0-3 4.2055925 3.26199 5.149195 ZT4-7 3.00589 3.00589 3.00589 ZT8-11 2.79643 2.79643 2.79643 ZT12-15 0 0 0 ZT16-19 4.290275 4.290275 4.290275 ZT20-23 3.94496 3.94496 3.94496