condition mean min max ZT0-3 58.8 58.8 58.8 ZT4-7 51.2 51.2 51.2 ZT8-11 48.1 48.1 48.1 ZT12-15 48.650000000000006 48.650000000000006 48.650000000000006 ZT16-19 43.599999999999994 43.599999999999994 43.599999999999994 ZT20-23 66.05 66.05 66.05