condition mean min max ZT0-3 48.5 48.5 48.5 ZT4-7 38.8 38.8 38.8 ZT8-11 58.900000000000006 58.900000000000006 58.900000000000006 ZT12-15 43.599999999999994 43.599999999999994 43.599999999999994 ZT16-19 67.94999999999999 67.94999999999999 67.94999999999999 ZT20-23 43.550000000000004 43.550000000000004 43.550000000000004