condition mean min max ZT0-3 132.60372245833332 128.12818136666667 137.07926355 ZT4-7 122.82754101666667 120.3468386 125.30824343333335 ZT8-11 135.41560379999999 122.0982749 148.7329327 ZT12-15 283.83651345 229.2339856 338.4390413 ZT16-19 398.6772891 371.2815848 426.0729934 ZT20-23 487.6102456 463.7521986333333 511.46829256666666