condition mean min max ZT0-3 95.630798 95.630798 95.630798 ZT4-7 86.907132 86.907132 86.907132 ZT8-11 75.555346 75.555346 75.555346 ZT12-15 70.3614925 70.3614925 70.3614925 ZT16-19 62.16066 62.16066 62.16066 ZT20-23 77.3425185 77.3425185 77.3425185