condition mean min max ZT0-3 656.2 656.2 656.2 ZT4-7 458.0 458.0 458.0 ZT8-11 426.29999999999995 426.29999999999995 426.29999999999995 ZT12-15 387.25 387.25 387.25 ZT16-19 510.85 510.85 510.85 ZT20-23 627.95 627.95 627.95