condition mean min max ZT0-3 290.847441 290.847441 290.847441 ZT4-7 349.131522 349.131522 349.131522 ZT8-11 320.536147 320.536147 320.536147 ZT12-15 307.91359750000004 307.91359750000004 307.91359750000004 ZT16-19 311.128469 311.128469 311.128469 ZT20-23 418.222709 418.222709 418.222709