condition mean min max ZT0-3 1.633498625 0.945606805 2.321390445 ZT4-7 2.5771017602499997 2.4676388334999997 2.6865646869999997 ZT8-11 1.68528018725 1.550719962 1.8198404125 ZT12-15 2.5551351959999997 1.8039801594999998 3.3062902324999994 ZT16-19 2.9125666755 2.5798413030000003 3.245292048 ZT20-23 5.967315698749999 5.200960404 6.7336709935