condition mean min max ZT0-3 420.468215 420.468215 420.468215 ZT4-7 204.9460755 204.9460755 204.9460755 ZT8-11 198.56825700000002 198.56825700000002 198.56825700000002 ZT12-15 227.06012199999998 227.06012199999998 227.06012199999998 ZT16-19 346.53974949999997 346.53974949999997 346.53974949999997 ZT20-23 363.280651 363.280651 363.280651