condition mean min max ZT0-3 1.204765 1.204765 1.204765 ZT4-7 0.697781 0.697781 0.697781 ZT8-11 1.15111 1.15111 1.15111 ZT12-15 1.46388 1.46388 1.46388 ZT16-19 1.8099750000000001 1.8099750000000001 1.8099750000000001 ZT20-23 1.0724315 1.0724315 1.0724315