condition mean min max ZT0-3 1.761107 0.234269 3.287945 ZT4-7 0.470311 0.470311 0.470311 ZT8-11 1.180545 1.180545 1.180545 ZT12-15 0 0 0 ZT16-19 1.61547 1.61547 1.61547 ZT20-23 0.4659665 0.4659665 0.4659665