condition mean min max ZT0-3 1.62894 1.62894 1.62894 ZT4-7 2.83666 2.83666 2.83666 ZT8-11 2.017735 2.017735 2.017735 ZT12-15 4.133884999999999 4.133884999999999 4.133884999999999 ZT16-19 3.0823549999999997 3.0823549999999997 3.0823549999999997 ZT20-23 2.467095 2.467095 2.467095