condition mean min max ZT0-3 30.91905 25.90285 35.935249999999996 ZT4-7 27.87853 27.87853 27.87853 ZT8-11 27.63575 27.63575 27.63575 ZT12-15 0 0 0 ZT16-19 76.1422 76.1422 76.1422 ZT20-23 48.6879 48.6879 48.6879