condition mean min max ZT0-3 172.681899 172.681899 172.681899 ZT4-7 164.883648 164.883648 164.883648 ZT8-11 165.033079 165.033079 165.033079 ZT12-15 195.1576565 195.1576565 195.1576565 ZT16-19 172.3376835 172.3376835 172.3376835 ZT20-23 185.517934 185.517934 185.517934