condition mean min max ZT0-3 166.751099 166.751099 166.751099 ZT4-7 156.628108 156.628108 156.628108 ZT8-11 156.78540099999998 156.78540099999998 156.78540099999998 ZT12-15 166.37762650000002 166.37762650000002 166.37762650000002 ZT16-19 190.58915050000002 190.58915050000002 190.58915050000002 ZT20-23 170.188673 170.188673 170.188673