condition mean min max ZT0-3 7.6295424999999994 7.319335 7.93975 ZT4-7 10.099340000000002 10.099340000000002 10.099340000000002 ZT8-11 11.429400000000001 11.429400000000001 11.429400000000001 ZT12-15 0 0 0 ZT16-19 12.093399999999999 12.093399999999999 12.093399999999999 ZT20-23 8.601425 8.601425 8.601425