condition mean min max ZT0-3 92.135281 92.135281 92.135281 ZT4-7 82.713964 82.713964 82.713964 ZT8-11 114.8595 114.8595 114.8595 ZT12-15 94.8853385 94.8853385 94.8853385 ZT16-19 96.6551495 96.6551495 96.6551495 ZT20-23 77.207444 77.207444 77.207444