condition mean min max ZT0-3 870.462826 870.462826 870.462826 ZT4-7 375.5511475 375.5511475 375.5511475 ZT8-11 106.1032745 106.1032745 106.1032745 ZT12-15 40.5109385 40.5109385 40.5109385 ZT16-19 469.956662 469.956662 469.956662 ZT20-23 1074.267263 1074.267263 1074.267263