condition mean min max ZT0-3 12.640925034 9.614726913 15.667123155 ZT4-7 20.3256621775 20.220102505 20.43122185 ZT8-11 15.673996715 14.59003774 16.75795569 ZT12-15 50.727084755 47.564477325 53.889692185 ZT16-19 66.39202374749999 59.508557505 73.27548999 ZT20-23 61.270554475 59.541820245 62.999288705