condition mean min max ZT0-3 1.0983143333333334 0.8859030000000001 1.3561 ZT4-7 0.3401375 0.3401375 0.3401375 ZT8-11 0.552456 0.552456 0.552456 ZT12-15 0.848994 0.6907875 1.0072005 ZT16-19 0.737671 0.737671 0.737671 ZT20-23 1.0636665 1.0636665 1.0636665