condition mean min max ZT0-3 324.018387 324.018387 324.018387 ZT4-7 652.0856484999999 652.0856484999999 652.0856484999999 ZT8-11 711.1742565 711.1742565 711.1742565 ZT12-15 510.22574599999996 510.22574599999996 510.22574599999996 ZT16-19 653.4221975 653.4221975 653.4221975 ZT20-23 698.380234 698.380234 698.380234