condition mean min max ZT0-3 73.515797 73.515797 73.515797 ZT4-7 41.2924905 41.2924905 41.2924905 ZT8-11 41.1017535 41.1017535 41.1017535 ZT12-15 57.297128 57.297128 57.297128 ZT16-19 67.1006615 67.1006615 67.1006615 ZT20-23 88.6729585 88.6729585 88.6729585