condition mean min max ZT0-3 9.40149 9.300640000000001 9.50234 ZT4-7 8.556755 8.556755 8.556755 ZT8-11 7.85731 7.85731 7.85731 ZT12-15 0 0 0 ZT16-19 7.294195 7.294195 7.294195 ZT20-23 7.4372799999999994 7.4372799999999994 7.4372799999999994