condition mean min max ZT0-3 0.5686125000000001 0.29140900000000003 0.7540925 ZT4-7 0.2451621 0.2451621 0.2451621 ZT8-11 0.503134 0.503134 0.503134 ZT12-15 1.20859 1.1923949999999999 1.224785 ZT16-19 1.245828 1.245828 1.245828 ZT20-23 0.975587 0.975587 0.975587