condition mean min max ZT0-3 0.66233108025 0.4725682185 0.852093942 ZT4-7 2.5612380803333332 1.7760562516666667 3.3464199089999997 ZT8-11 5.7174053535 4.918215149 6.516595558 ZT12-15 7.076252784 6.968599417 7.183906151 ZT16-19 9.096356421166668 8.671071593666667 9.521641248666667 ZT20-23 6.308173451166667 5.942691433333334 6.673655469