condition mean min max ZT0-3 16.487325 16.11695 16.8577 ZT4-7 10.574729999999999 10.574729999999999 10.574729999999999 ZT8-11 9.11646 9.11646 9.11646 ZT12-15 0 0 0 ZT16-19 23.02375 23.02375 23.02375 ZT20-23 21.28255 21.28255 21.28255