condition mean min max ZT0-3 0.6275210265 0.5416430809999999 0.713398972 ZT4-7 2.3081242785 1.6581338115 2.9581147454999996 ZT8-11 4.747528416 4.1795617345 5.3154950974999995 ZT12-15 17.0369768255 12.087781545999999 21.986172105 ZT16-19 16.62558084 16.3843354 16.86682628 ZT20-23 24.3140711325 20.705449205 27.92269306