condition mean min max ZT0-3 262.378791 262.378791 262.378791 ZT4-7 349.058439 349.058439 349.058439 ZT8-11 324.2849665 324.2849665 324.2849665 ZT12-15 324.24396 324.24396 324.24396 ZT16-19 283.79710050000006 283.79710050000006 283.79710050000006 ZT20-23 262.1954535 262.1954535 262.1954535