condition mean min max ZT0-3 327.08241425 278.95874510000004 375.20608339999995 ZT4-7 371.76600685 362.87016889999995 380.66184480000004 ZT8-11 200.191053175 166.0365842 234.34552215000002 ZT12-15 131.889522215 107.600037915 156.17900651500003 ZT16-19 253.87406975 225.11204325 282.63609625 ZT20-23 338.526560775 327.6093264 349.44379515