condition mean min max ZT0-3 29.7341 29.7341 29.7341 ZT4-7 24.001408333333334 24.001408333333334 24.001408333333334 ZT8-11 24.522475 24.522475 24.522475 ZT12-15 40.358025 40.358025 40.358025 ZT16-19 21.89765 21.89765 21.89765 ZT20-23 19.228925 19.228925 19.228925