condition mean min max ZT0-3 346.072984 346.072984 346.072984 ZT4-7 317.596292 317.596292 317.596292 ZT8-11 237.38358799999997 237.38358799999997 237.38358799999997 ZT12-15 213.70177950000001 213.70177950000001 213.70177950000001 ZT16-19 171.1114455 171.1114455 171.1114455 ZT20-23 215.5792555 215.5792555 215.5792555