condition mean min max ZT0-3 0.33180874274999994 0.306412077 0.35720540849999993 ZT4-7 0.715142712 0.3778403205 1.0524451035 ZT8-11 1.6774309554999998 1.350388602 2.0044733089999998 ZT12-15 1.6830551759999999 1.483060257 1.8830500949999998 ZT16-19 1.34180671775 1.1924311585 1.491182277 ZT20-23 2.28115473775 2.275585725 2.2867237505