condition mean min max ZT0-3 208.544449 208.544449 208.544449 ZT4-7 201.67111599999998 201.67111599999998 201.67111599999998 ZT8-11 131.2701165 131.2701165 131.2701165 ZT12-15 166.0526465 166.0526465 166.0526465 ZT16-19 109.2780665 109.2780665 109.2780665 ZT20-23 97.918284 97.918284 97.918284