condition mean min max ZT0-3 34.962262 34.962262 34.962262 ZT4-7 42.443731 42.443731 42.443731 ZT8-11 44.3832985 44.3832985 44.3832985 ZT12-15 39.477838500000004 39.477838500000004 39.477838500000004 ZT16-19 70.05055 70.05055 70.05055 ZT20-23 101.980424 101.980424 101.980424