condition mean min max ZT0-3 2.5616938755 0.8102005809999999 4.31318717 ZT4-7 6.749443064 3.1371809715 10.361705156500001 ZT8-11 39.302989925 31.313088179999998 47.29289167 ZT12-15 81.47215765 79.943356725 83.000958575 ZT16-19 65.583990755 61.808615755000005 69.359365755 ZT20-23 56.539112985 55.616792430000004 57.46143354