condition mean min max ZT0-3 1.61002 1.60698 1.61306 ZT4-7 2.0788599999999997 2.0788599999999997 2.0788599999999997 ZT8-11 2.23857 2.23857 2.23857 ZT12-15 0 0 0 ZT16-19 2.19958 2.19958 2.19958 ZT20-23 2.427245 2.427245 2.427245