condition mean min max ZT0-3 11.485075 11.146799999999999 11.823350000000001 ZT4-7 12.93205 12.93205 12.93205 ZT8-11 15.096599999999999 15.096599999999999 15.096599999999999 ZT12-15 0 0 0 ZT16-19 17.31245 17.31245 17.31245 ZT20-23 16.672649999999997 16.672649999999997 16.672649999999997