condition mean min max ZT0-3 2.7874022354999997 1.591771456 3.9830330149999993 ZT4-7 5.67121390275 4.678574759 6.6638530465 ZT8-11 11.12729537425 8.765989501 13.4886012475 ZT12-15 9.818841475249998 6.858601695499999 12.779081254999998 ZT16-19 5.802468039500001 5.0605694595 6.544366619500001 ZT20-23 3.41153848825 3.1707913095 3.652285667