condition mean min max ZT0-3 9.94934717975 9.2055089075 10.693185452 ZT4-7 10.104825476833334 9.828329979000001 10.381320974666666 ZT8-11 9.351037222166667 9.197419474333334 9.50465497 ZT12-15 7.0769039235 6.533524071333334 7.620283775666667 ZT16-19 6.826250416000001 6.809585348 6.842915484000001 ZT20-23 7.428479883833333 6.7923427940000005 8.064616973666666