condition mean min max ZT0-3 24.700000000000003 24.700000000000003 24.700000000000003 ZT4-7 29.4 29.4 29.4 ZT8-11 16.85 16.85 16.85 ZT12-15 24.65 24.65 24.65 ZT16-19 21.049999999999997 21.049999999999997 21.049999999999997 ZT20-23 32.5 32.5 32.5