condition mean min max ZT0-3 0.91144131875 0.8810060365000001 0.9418766009999999 ZT4-7 2.13842968775 1.9724629945 2.304396381 ZT8-11 2.759658835 2.4459061770000003 3.073411493 ZT12-15 7.96148321775 7.034920846 8.888045589499999 ZT16-19 10.260526135500001 9.9224109575 10.5986413135 ZT20-23 9.2297808145 8.892144001 9.567417628000001