condition mean min max ZT0-3 150.876635 150.876635 150.876635 ZT4-7 141.63753050000003 141.63753050000003 141.63753050000003 ZT8-11 135.6867905 135.6867905 135.6867905 ZT12-15 145.7911765 145.7911765 145.7911765 ZT16-19 133.96306249999998 133.96306249999998 133.96306249999998 ZT20-23 162.2660885 162.2660885 162.2660885