condition mean min max ZT0-3 12.233125000000001 12.12705 12.339200000000002 ZT4-7 8.328175 8.328175 8.328175 ZT8-11 7.707190000000001 7.707190000000001 7.707190000000001 ZT12-15 0 0 0 ZT16-19 12.41615 12.41615 12.41615 ZT20-23 10.91965 10.91965 10.91965