condition mean min max ZT0-3 454.492953 454.492953 454.492953 ZT4-7 286.1932375 286.1932375 286.1932375 ZT8-11 293.7277325 293.7277325 293.7277325 ZT12-15 359.1108555 359.1108555 359.1108555 ZT16-19 527.1923285 527.1923285 527.1923285 ZT20-23 605.6939635 605.6939635 605.6939635