condition mean min max ZT0-3 0.365994 0.365994 0.365994 ZT4-7 0.2250165 0.2250165 0.2250165 ZT8-11 0.3833475 0.3833475 0.3833475 ZT12-15 0.6542954999999999 0.6542954999999999 0.6542954999999999 ZT16-19 0.6173995 0.6173995 0.6173995 ZT20-23 0.37693849999999995 0.37693849999999995 0.37693849999999995