condition mean min max ZT0-3 328.095756 328.095756 328.095756 ZT4-7 333.89619700000003 333.89619700000003 333.89619700000003 ZT8-11 373.3780685 373.3780685 373.3780685 ZT12-15 390.69288500000005 390.69288500000005 390.69288500000005 ZT16-19 347.735403 347.735403 347.735403 ZT20-23 284.96407 284.96407 284.96407