condition mean min max ZT0-3 3.1218025000000003 2.899885 3.3437200000000002 ZT4-7 2.769815 2.769815 2.769815 ZT8-11 3.770805 3.770805 3.770805 ZT12-15 0 0 0 ZT16-19 4.579095000000001 4.579095000000001 4.579095000000001 ZT20-23 4.119825 4.119825 4.119825