condition mean min max ZT0-3 16.0805930925 15.82217005 16.339016134999998 ZT4-7 13.64573938225 11.0238217345 16.26765703 ZT8-11 17.36052751 14.56514123 20.15591379 ZT12-15 16.579692325000003 15.93905269 17.220331960000003 ZT16-19 16.053985545000003 15.658116175 16.449854915000003 ZT20-23 19.45142117 19.35714351 19.54569883