condition mean min max ZT0-3 3.78277771525 3.1624598460000004 4.4030955845 ZT4-7 3.9768428910000004 3.6250683845 4.3286173975 ZT8-11 8.804990137499999 5.923537797 11.686442478 ZT12-15 10.990747837 10.9360615975 11.045434076500001 ZT16-19 6.83110275775 6.3493413825000005 7.312864133 ZT20-23 6.34639468075 5.939252792 6.7535365695