condition mean min max ZT0-3 67.007565 67.007565 67.007565 ZT4-7 55.9250845 55.9250845 55.9250845 ZT8-11 50.000885499999995 50.000885499999995 50.000885499999995 ZT12-15 69.0526705 69.0526705 69.0526705 ZT16-19 68.669995 68.669995 68.669995 ZT20-23 60.6278975 60.6278975 60.6278975