condition mean min max ZT0-3 63.271371 63.271371 63.271371 ZT4-7 101.9479595 101.9479595 101.9479595 ZT8-11 115.085576 115.085576 115.085576 ZT12-15 124.6207855 124.6207855 124.6207855 ZT16-19 106.5763835 106.5763835 106.5763835 ZT20-23 114.669409 114.669409 114.669409