condition mean min max ZT0-3 9.349969999999999 9.349969999999999 9.349969999999999 ZT4-7 10.66115 10.66115 10.66115 ZT8-11 8.27553 8.27553 8.27553 ZT12-15 9.188120000000001 9.188120000000001 9.188120000000001 ZT16-19 10.488615 10.488615 10.488615 ZT20-23 9.227115 9.227115 9.227115