condition mean min max ZT0-3 733.309015 733.309015 733.309015 ZT4-7 1432.065241 1432.065241 1432.065241 ZT8-11 1263.093797 1263.093797 1263.093797 ZT12-15 583.8024175 583.8024175 583.8024175 ZT16-19 283.3180675 283.3180675 283.3180675 ZT20-23 270.8089795 270.8089795 270.8089795