condition mean min max ZT0-3 4358.131174 4358.131174 4358.131174 ZT4-7 4104.593744 4104.593744 4104.593744 ZT8-11 3076.074627 3076.074627 3076.074627 ZT12-15 3019.693623 3019.693623 3019.693623 ZT16-19 1989.239057 1989.239057 1989.239057 ZT20-23 1876.304094 1876.304094 1876.304094