condition mean min max ZT0-3 11.074471 11.074471 11.074471 ZT4-7 10.2526245 10.2526245 10.2526245 ZT8-11 9.9132325 9.9132325 9.9132325 ZT12-15 10.952974999999999 10.952974999999999 10.952974999999999 ZT16-19 11.671467 11.671467 11.671467 ZT20-23 11.636255 11.636255 11.636255