condition mean min max ZT0-3 11.748148 11.748148 11.748148 ZT4-7 10.510273999999999 10.510273999999999 10.510273999999999 ZT8-11 8.542176999999999 8.542176999999999 8.542176999999999 ZT12-15 10.103063 10.103063 10.103063 ZT16-19 10.5737015 10.5737015 10.5737015 ZT20-23 9.2117845 9.2117845 9.2117845