condition mean min max ZT0-3 12.572852044 9.685364403 15.460339685 ZT4-7 7.143453279666667 6.77882574 7.508080819333333 ZT8-11 5.982122321833333 5.6579984009999995 6.306246242666666 ZT12-15 10.680024771500001 8.746649874000001 12.613399669 ZT16-19 9.089812084333333 8.365678221 9.813945947666667 ZT20-23 8.995747939000001 8.983971770666667 9.007524107333333