Past measurements of the angular distributions for (d,p) and (p,d) reactions on targets with Z=3-24 leading to the ground states have been analyzed systematically using the theory of Johnson-Soper adiabatic approximation and Distorted-Wave Born-Approximation, adopting nucleon-nucleus global optical model potentials as input. In all, the ground state neutron spectroscopic factors (SF) for 80 nuclei have been obtained. The consistency of the method is evaluated by comparing spectroscopic factors obtained separately in (p,d) and (d,p) reactions. The values also correlate strongly with Endt's compilation when available, but the current method of extracting spectroscopic factors is more general and the values obtained are more consistent.