condition mean min max ZT0-3 1.01109775 0.862164 1.1600315 ZT4-7 2.32468 2.32468 2.32468 ZT8-11 2.319195 2.319195 2.319195 ZT12-15 0 0 0 ZT16-19 4.27947 4.27947 4.27947 ZT20-23 1.1492 1.1492 1.1492