condition mean min max ZT0-3 1.3806433333333334 1.2999100000000001 1.505735 ZT4-7 0.6525110000000001 0.6525110000000001 0.6525110000000001 ZT8-11 4.501225 4.501225 4.501225 ZT12-15 6.757982500000001 6.09938 7.416585 ZT16-19 6.68393 6.68393 6.68393 ZT20-23 2.2396 2.2396 2.2396