condition mean min max ZT0-3 2.6255226804999996 2.136709904 3.1143354569999997 ZT4-7 0.94698903875 0.8073993575 1.0865787199999999 ZT8-11 1.23675545425 1.1106420830000001 1.3628688255 ZT12-15 3.22197100925 2.516808696 3.9271333224999996 ZT16-19 3.9085635815 3.7516293775 4.0654977855 ZT20-23 4.7581278417499995 2.7174570585 6.798798625