condition mean min max ZT0-3 17.401449999999997 17.401449999999997 17.401449999999997 ZT4-7 15.6409 15.6409 15.6409 ZT8-11 14.97515 14.97515 14.97515 ZT12-15 17.8315 17.8315 17.8315 ZT16-19 18.293799999999997 18.293799999999997 18.293799999999997 ZT20-23 18.528350000000003 18.528350000000003 18.528350000000003