condition mean min max ZT0-3 261.172564 261.172564 261.172564 ZT4-7 303.641502 303.641502 303.641502 ZT8-11 340.941952 340.941952 340.941952 ZT12-15 360.318094 360.318094 360.318094 ZT16-19 313.8245885 313.8245885 313.8245885 ZT20-23 346.1280665 346.1280665 346.1280665