condition mean min max ZT0-3 23.595933333333335 7.4750499999999995 32.8327 ZT4-7 7.955325 7.955325 7.955325 ZT8-11 7.25829 7.25829 7.25829 ZT12-15 13.0174375 9.512075 16.5228 ZT16-19 20.77345 20.77345 20.77345 ZT20-23 29.505850000000002 29.505850000000002 29.505850000000002