condition mean min max ZT0-3 341.322544 341.322544 341.322544 ZT4-7 607.533799 607.533799 607.533799 ZT8-11 591.5996 591.5996 591.5996 ZT12-15 506.22632250000004 506.22632250000004 506.22632250000004 ZT16-19 389.134138 389.134138 389.134138 ZT20-23 300.40721 300.40721 300.40721