condition mean min max ZT0-3 0.0895914 0.0 0.1348295 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0147842 0.0147842 0.0147842 ZT12-15 0.029046175 0.01479425 0.0432981 ZT16-19 0.07062500000000001 0.07062500000000001 0.07062500000000001 ZT20-23 0.0629241 0.0629241 0.0629241