condition mean min max ZT0-3 77.25 77.25 77.25 ZT4-7 70.0 70.0 70.0 ZT8-11 75.4 75.4 75.4 ZT12-15 69.45 69.45 69.45 ZT16-19 56.900000000000006 56.900000000000006 56.900000000000006 ZT20-23 61.349999999999994 61.349999999999994 61.349999999999994