condition mean min max ZT0-3 35.42805 27.6132 41.25105 ZT4-7 25.8316 25.8316 25.8316 ZT8-11 41.5527 41.5527 41.5527 ZT12-15 54.4607 54.19745 54.72395 ZT16-19 54.88695 54.88695 54.88695 ZT20-23 53.59465 53.59465 53.59465