condition mean min max ZT0-3 1.65735946125 0.531903828 2.7828150945 ZT4-7 12.946897994 9.903065703 15.990730285 ZT8-11 6.91196938575 5.153144429499999 8.670794342 ZT12-15 6.14267727625 3.8430036215000003 8.442350931 ZT16-19 18.27309598625 12.6294306875 23.916761285 ZT20-23 51.2151499875 39.395559605 63.03474037