condition mean min max ZT0-3 63.410389 63.410389 63.410389 ZT4-7 64.405204 64.405204 64.405204 ZT8-11 67.81212099999999 67.81212099999999 67.81212099999999 ZT12-15 66.5654355 66.5654355 66.5654355 ZT16-19 73.546493 73.546493 73.546493 ZT20-23 67.3475385 67.3475385 67.3475385