condition mean min max ZT0-3 8.77004 7.9900400000000005 9.55004 ZT4-7 3.069565 3.069565 3.069565 ZT8-11 2.64034 2.64034 2.64034 ZT12-15 0 0 0 ZT16-19 7.032400000000001 7.032400000000001 7.032400000000001 ZT20-23 6.57105 6.57105 6.57105