condition mean min max ZT0-3 56.15 56.15 56.15 ZT4-7 79.3 79.3 79.3 ZT8-11 72.95 72.95 72.95 ZT12-15 29.4 29.4 29.4 ZT16-19 59.349999999999994 59.349999999999994 59.349999999999994 ZT20-23 67.6 67.6 67.6