condition mean min max ZT0-3 63.186375 63.11835 63.254400000000004 ZT4-7 23.7735 23.7735 23.7735 ZT8-11 8.695645 8.695645 8.695645 ZT12-15 0 0 0 ZT16-19 16.19595 16.19595 16.19595 ZT20-23 37.66335 37.66335 37.66335