condition mean min max ZT0-3 0.493153 0.3308435 0.7217825 ZT4-7 0.24855899999999997 0.24855899999999997 0.24855899999999997 ZT8-11 0.460258 0.460258 0.460258 ZT12-15 0.73250975 0.6474215 0.817598 ZT16-19 0.6246155 0.6246155 0.6246155 ZT20-23 0.5012004999999999 0.5012004999999999 0.5012004999999999