condition mean min max ZT0-3 51.15 51.15 51.15 ZT4-7 52.4 52.4 52.4 ZT8-11 21.650000000000002 21.650000000000002 21.650000000000002 ZT12-15 29.5 29.5 29.5 ZT16-19 54.05 54.05 54.05 ZT20-23 70.05 70.05 70.05