condition mean min max ZT0-3 578.385903 578.385903 578.385903 ZT4-7 626.175363 626.175363 626.175363 ZT8-11 559.5654565 559.5654565 559.5654565 ZT12-15 534.161463 534.161463 534.161463 ZT16-19 538.2900360000001 538.2900360000001 538.2900360000001 ZT20-23 458.490367 458.490367 458.490367