condition mean min max ZT0-3 230.157675 230.157675 230.157675 ZT4-7 222.97475300000002 222.97475300000002 222.97475300000002 ZT8-11 241.06305400000002 241.06305400000002 241.06305400000002 ZT12-15 313.910933 313.910933 313.910933 ZT16-19 265.775919 265.775919 265.775919 ZT20-23 215.201273 215.201273 215.201273