condition mean min max ZT0-3 4.559035 4.498445 4.619625 ZT4-7 5.6565449999999995 5.6565449999999995 5.6565449999999995 ZT8-11 5.544485 5.544485 5.544485 ZT12-15 0 0 0 ZT16-19 5.06584 5.06584 5.06584 ZT20-23 5.58453 5.58453 5.58453