condition mean min max ZT0-3 16.114773435 14.732211790000001 17.49733508 ZT4-7 11.759777393 11.172555021 12.346999765 ZT8-11 9.2952199185 8.534638277500001 10.0558015595 ZT12-15 10.479908180750002 9.3008495235 11.658966838000001 ZT16-19 16.6873424675 14.10269326 19.271991675 ZT20-23 25.535298994999998 21.638808405 29.431789585