condition mean min max ZT0-3 34.0926430275 32.94265449 35.242631564999996 ZT4-7 32.312102615 29.835395236666667 34.78880999333333 ZT8-11 32.63685149 31.51853618 33.7551668 ZT12-15 26.4864652 24.73256462 28.24036578 ZT16-19 28.450669053333332 27.21036211 29.690975996666666 ZT20-23 30.497838056666666 28.095459293333334 32.90021682