Screening and recruiting hours per completion Hours per completion Overall cost per interview

Ratio (cell/landline) SRHPC ratio HPC ratio Cost ratio
Mean 2.53 2.00 2.05
Minimum 1.21 1.17 1.35
Maximum 5.37 3.47 3.97
N 26 26 20
Std. deviation 1.02 0.63 0.77