condition mean min max ZT0-3 1.707065 1.707065 1.707065 ZT4-7 3.56377 3.56377 3.56377 ZT8-11 0.962455 0.962455 0.962455 ZT12-15 0.0 0.0 0.0 ZT16-19 1.02741 1.02741 1.02741 ZT20-23 0.514865 0.514865 0.514865