condition mean min max ZT0-3 22.18355 20.51475 23.68965 ZT4-7 16.3149 16.3149 16.3149 ZT8-11 11.385829999999999 11.385829999999999 11.385829999999999 ZT12-15 16.372975 16.16 16.58595 ZT16-19 15.69035 15.69035 15.69035 ZT20-23 19.957 19.957 19.957