condition mean min max ZT0-3 22.599999999999998 22.599999999999998 22.599999999999998 ZT4-7 62.6 62.6 62.6 ZT8-11 56.15 56.15 56.15 ZT12-15 37.349999999999994 37.349999999999994 37.349999999999994 ZT16-19 40.900000000000006 40.900000000000006 40.900000000000006 ZT20-23 51.35 51.35 51.35