condition mean min max ZT0-3 397.04999999999995 397.04999999999995 397.04999999999995 ZT4-7 447.8 447.8 447.8 ZT8-11 484.35 484.35 484.35 ZT12-15 539.75 539.75 539.75 ZT16-19 498.2 498.2 498.2 ZT20-23 401.0 401.0 401.0