condition mean min max ZT0-3 12.2318271575 11.90992894 12.553725374999999 ZT4-7 15.8499362775 15.578896219999999 16.120976335 ZT8-11 15.415359062499999 14.26426659 16.566451535 ZT12-15 19.505445270000003 18.358988355 20.651902185 ZT16-19 35.308846557500004 26.652998615 43.9646945 ZT20-23 75.8221440975 60.72268639 90.921601805