condition mean min max ZT0-3 316.357521 316.357521 316.357521 ZT4-7 303.55572700000005 303.55572700000005 303.55572700000005 ZT8-11 255.9312025 255.9312025 255.9312025 ZT12-15 276.3404655 276.3404655 276.3404655 ZT16-19 308.7656415 308.7656415 308.7656415 ZT20-23 331.026521 331.026521 331.026521