condition mean min max ZT0-3 10.97185 10.97185 10.97185 ZT4-7 8.295945 8.295945 8.295945 ZT8-11 10.81455 10.81455 10.81455 ZT12-15 28.988799999999998 28.988799999999998 28.988799999999998 ZT16-19 19.9227 19.9227 19.9227 ZT20-23 13.60915 13.60915 13.60915