condition mean min max ZT0-3 2.2782774999999997 2.11851 2.438045 ZT4-7 4.888605 4.888605 4.888605 ZT8-11 5.4198699999999995 5.4198699999999995 5.4198699999999995 ZT12-15 0 0 0 ZT16-19 3.978605 3.978605 3.978605 ZT20-23 3.51565 3.51565 3.51565