condition mean min max ZT0-3 72.00452897 67.74249658 76.26656136 ZT4-7 70.362957185 67.85343782 72.87247655 ZT8-11 74.24603157166666 72.61633900333334 75.87572414 ZT12-15 70.67095562 69.60290878666666 71.73900245333334 ZT16-19 81.439820505 78.01949999333334 84.86014101666667 ZT20-23 89.76988527666667 89.28813024333334 90.25164031