condition mean min max ZT0-3 214.693595 214.693595 214.693595 ZT4-7 207.5737245 207.5737245 207.5737245 ZT8-11 217.59107799999998 217.59107799999998 217.59107799999998 ZT12-15 278.8608365 278.8608365 278.8608365 ZT16-19 197.2494175 197.2494175 197.2494175 ZT20-23 114.16212449999999 114.16212449999999 114.16212449999999