condition mean min max ZT0-3 0.39698316666666666 0.29586599999999996 0.4674645 ZT4-7 0.24109150000000001 0.24109150000000001 0.24109150000000001 ZT8-11 0.12440655 0.12440655 0.12440655 ZT12-15 0.17158679999999998 0.13233555 0.21083805 ZT16-19 0.47600549999999997 0.47600549999999997 0.47600549999999997 ZT20-23 0.7519910000000001 0.7519910000000001 0.7519910000000001