condition mean min max ZT0-3 1.75712521325 0.9684724920000001 2.5457779345 ZT4-7 5.12027455225 5.0966905725 5.143858531999999 ZT8-11 4.40366992775 4.296353418000001 4.5109864375 ZT12-15 11.845216398249999 9.8062031715 13.884229625 ZT16-19 17.7195964425 17.049251385 18.3899415 ZT20-23 23.01368684 22.664486325 23.362887354999998