condition mean min max ZT0-3 14.106765 10.145695 17.77715 ZT4-7 11.7246 11.7246 11.7246 ZT8-11 32.0907 32.0907 32.0907 ZT12-15 37.046125 34.4884 39.60385 ZT16-19 31.5024 31.5024 31.5024 ZT20-23 30.9677 30.9677 30.9677