condition mean min max ZT0-3 10.050341 10.050341 10.050341 ZT4-7 12.171962 12.171962 12.171962 ZT8-11 11.460729 11.460729 11.460729 ZT12-15 10.6002665 10.6002665 10.6002665 ZT16-19 13.045569 13.045569 13.045569 ZT20-23 10.931346 10.931346 10.931346