An unbiased search of molecular outflows within the region of the COHRS survey has identified 157 high-mass outflows from a sample of 770 ATLASGAL clumps with a detection rate of 20 % .
The detection rate of outflows increases for clumps with higher M _ { clump } , L _ { bol } , L _ { bol } /M _ { clump } , N _ { H _ { 2 } } , and T _ { dust } compared to the clumps with no outflow .
The detection rates of the outflow increases from protostellar ( 8 % ) to YSO clump ( 17 % ) and to MSF clump ( 29 % ) .
The detection rate 26 % for quiescent clump is preliminary , because the sample of quiescent clumps is small .
A statistical relation between the outflow and clump masses for our sample is \log ( M _ { out } / M _ { \bigodot } ) = ( -1.1 \pm 0.21 ) + ( 0.9 \pm 0.07 ) \log ( M _ { clump } / M _ { % \bigodot } ) .
The detection rate of outflows and the outflow mass-loss rate show an increase with increasing M _ { clump } , L _ { bol } , N _ { H _ { 2 } } , and T _ { dust } , which indicates that clumps with outflow with higher parameter values are at a more advanced evolutionary stage .
The outflow mechanical force increases with increasing bolometric luminosities .
No clear evidence has yet been found that higher mass outflows have different launching conditions than low-mass outflows .