condition mean min max ZT0-3 110.268471 110.268471 110.268471 ZT4-7 79.1219465 79.1219465 79.1219465 ZT8-11 87.93715 87.93715 87.93715 ZT12-15 112.0462645 112.0462645 112.0462645 ZT16-19 175.130324 175.130324 175.130324 ZT20-23 210.9442635 210.9442635 210.9442635