condition mean min max ZT0-3 26.27148760925 15.9403117985 36.60266342 ZT4-7 22.8955985125 17.21088397 28.580313054999998 ZT8-11 50.92936527 48.524675585 53.334054955 ZT12-15 67.4235562825 63.52948005500001 71.31763251 ZT16-19 63.388197215000005 57.0383361 69.73805833 ZT20-23 46.991645559999995 45.324394715 48.658896405