condition mean min max ZT0-3 138.770518 138.770518 138.770518 ZT4-7 217.5092125 217.5092125 217.5092125 ZT8-11 713.0034585 713.0034585 713.0034585 ZT12-15 320.38955450000003 320.38955450000003 320.38955450000003 ZT16-19 462.0347945 462.0347945 462.0347945 ZT20-23 366.769865 366.769865 366.769865