condition mean min max ZT0-3 15.96791198475 11.2413901295 20.69443384 ZT4-7 9.0250169795 8.5992275465 9.4508064125 ZT8-11 12.8959828725 12.085100805 13.706864939999999 ZT12-15 15.047062630000001 13.549343335 16.544781925000002 ZT16-19 18.162524675 17.657611135 18.667438215 ZT20-23 19.190955109999997 19.10976621 19.272144009999998