condition mean min max ZT0-3 8.11907391125 6.613222105 9.6249257175 ZT4-7 10.171928721250001 9.1850724775 11.158784965 ZT8-11 10.0183093135 9.641360482 10.395258145 ZT12-15 12.20818322275 10.3679646905 14.048401755 ZT16-19 12.912652855 11.209188665 14.616117045 ZT20-23 25.082936925 21.405408854999997 28.760464995