condition mean min max ZT0-3 0.3673555 0.3673555 0.3673555 ZT4-7 0.5092945 0.5092945 0.5092945 ZT8-11 0.2071175 0.2071175 0.2071175 ZT12-15 0.588489 0.588489 0.588489 ZT16-19 0.669679 0.669679 0.669679 ZT20-23 0.110797 0.110797 0.110797