condition mean min max ZT0-3 103.924367 103.924367 103.924367 ZT4-7 90.866417 90.866417 90.866417 ZT8-11 92.2585765 92.2585765 92.2585765 ZT12-15 96.204206 96.204206 96.204206 ZT16-19 145.3529815 145.3529815 145.3529815 ZT20-23 193.6069015 193.6069015 193.6069015