condition mean min max ZT0-3 1.031065 0.0 2.06213 ZT4-7 3.47512 3.47512 3.47512 ZT8-11 1.37812 1.37812 1.37812 ZT12-15 0 0 0 ZT16-19 2.03086 2.03086 2.03086 ZT20-23 0.676175 0.676175 0.676175