condition mean min max ZT0-3 171.87566666666666 120.3545 206.6345 ZT4-7 76.6247 76.6247 76.6247 ZT8-11 61.750699999999995 61.750699999999995 61.750699999999995 ZT12-15 85.74080000000001 85.06995 86.41165000000001 ZT16-19 103.0215 103.0215 103.0215 ZT20-23 179.45100000000002 179.45100000000002 179.45100000000002