condition mean min max ZT0-3 169.819872 169.819872 169.819872 ZT4-7 205.6501535 205.6501535 205.6501535 ZT8-11 221.10391449999997 221.10391449999997 221.10391449999997 ZT12-15 220.7670475 220.7670475 220.7670475 ZT16-19 209.924647 209.924647 209.924647 ZT20-23 195.0952475 195.0952475 195.0952475