condition mean min max ZT0-3 65.934371 65.934371 65.934371 ZT4-7 56.538554000000005 56.538554000000005 56.538554000000005 ZT8-11 65.760289 65.760289 65.760289 ZT12-15 61.29947799999999 61.29947799999999 61.29947799999999 ZT16-19 108.9588335 108.9588335 108.9588335 ZT20-23 81.8108695 81.8108695 81.8108695