condition mean min max ZT0-3 7.669074999999999 7.5401299999999996 7.7918899999999995 ZT4-7 5.733404999999999 5.733404999999999 5.733404999999999 ZT8-11 7.936450000000001 7.936450000000001 7.936450000000001 ZT12-15 12.2239775 9.934505 14.513449999999999 ZT16-19 10.10782 10.10782 10.10782 ZT20-23 10.58435 10.58435 10.58435