condition mean min max ZT0-3 7.115195 7.115195 7.115195 ZT4-7 3.962085 3.962085 3.962085 ZT8-11 2.649965 2.649965 2.649965 ZT12-15 6.365 6.365 6.365 ZT16-19 10.26925 10.26925 10.26925 ZT20-23 9.83091 9.83091 9.83091