condition mean min max ZT0-3 0.5205595000000001 0.36057500000000003 0.7741935 ZT4-7 0.41032599999999997 0.41032599999999997 0.41032599999999997 ZT8-11 0.29728075 0.29728075 0.29728075 ZT12-15 2.04984 1.77443 2.32525 ZT16-19 1.1769335 1.1769335 1.1769335 ZT20-23 0.9082395 0.9082395 0.9082395