condition mean min max ZT0-3 15.700783333333334 12.4326 17.58475 ZT4-7 8.87421 8.87421 8.87421 ZT8-11 6.02099 6.02099 6.02099 ZT12-15 11.231145 10.936805 11.525485 ZT16-19 12.59965 12.59965 12.59965 ZT20-23 19.6384 19.6384 19.6384