condition mean min max ZT0-3 9.608852 9.608852 9.608852 ZT4-7 9.9542655 9.9542655 9.9542655 ZT8-11 7.956768 7.956768 7.956768 ZT12-15 9.1169005 9.1169005 9.1169005 ZT16-19 8.0205655 8.0205655 8.0205655 ZT20-23 8.5893835 8.5893835 8.5893835