condition mean min max ZT0-3 428.847441 428.847441 428.847441 ZT4-7 587.3405 587.3405 587.3405 ZT8-11 597.6487535 597.6487535 597.6487535 ZT12-15 488.98809600000004 488.98809600000004 488.98809600000004 ZT16-19 485.33137 485.33137 485.33137 ZT20-23 527.7046760000001 527.7046760000001 527.7046760000001