condition mean min max ZT0-3 177.155134 177.155134 177.155134 ZT4-7 100.67342149999999 100.67342149999999 100.67342149999999 ZT8-11 74.91667749999999 74.91667749999999 74.91667749999999 ZT12-15 80.717893 80.717893 80.717893 ZT16-19 159.8720845 159.8720845 159.8720845 ZT20-23 185.2963745 185.2963745 185.2963745