condition mean min max ZT0-3 26.986714 26.986714 26.986714 ZT4-7 28.322035999999997 28.322035999999997 28.322035999999997 ZT8-11 26.318003 26.318003 26.318003 ZT12-15 26.474441 26.474441 26.474441 ZT16-19 29.9206 29.9206 29.9206 ZT20-23 30.726263 30.726263 30.726263