condition mean min max ZT0-3 152.67925 131.074 174.28449999999998 ZT4-7 121.9615 121.9615 121.9615 ZT8-11 87.17535000000001 87.17535000000001 87.17535000000001 ZT12-15 0 0 0 ZT16-19 111.8099 111.8099 111.8099 ZT20-23 116.4825 116.4825 116.4825