condition mean min max ZT0-3 83.29955 78.5317 89.41065 ZT4-7 73.358 73.358 73.358 ZT8-11 80.80935 80.80935 80.80935 ZT12-15 84.653275 81.4142 87.89235 ZT16-19 73.64555 73.64555 73.64555 ZT20-23 64.99515 64.99515 64.99515