condition mean min max ZT0-3 3.2380675 2.89489 3.581245 ZT4-7 3.641085 3.641085 3.641085 ZT8-11 1.54197 1.54197 1.54197 ZT12-15 0 0 0 ZT16-19 2.124765 2.124765 2.124765 ZT20-23 3.0753950000000003 3.0753950000000003 3.0753950000000003