condition mean min max ZT0-3 414.994082 414.994082 414.994082 ZT4-7 211.96898249999998 211.96898249999998 211.96898249999998 ZT8-11 246.84421700000001 246.84421700000001 246.84421700000001 ZT12-15 332.1411005 332.1411005 332.1411005 ZT16-19 380.170195 380.170195 380.170195 ZT20-23 436.574584 436.574584 436.574584