condition mean min max ZT0-3 46.84 46.84 46.84 ZT4-7 28.19905 28.19905 28.19905 ZT8-11 24.9363 24.9363 24.9363 ZT12-15 37.431349999999995 37.431349999999995 37.431349999999995 ZT16-19 54.354749999999996 54.354749999999996 54.354749999999996 ZT20-23 58.59625 58.59625 58.59625