condition mean min max ZT0-3 3.4262750000000004 3.343385 3.5091650000000003 ZT4-7 3.6373550000000003 3.6373550000000003 3.6373550000000003 ZT8-11 5.8079149999999995 5.8079149999999995 5.8079149999999995 ZT12-15 0 0 0 ZT16-19 6.531775 6.531775 6.531775 ZT20-23 4.70838 4.70838 4.70838