Table 3: Nature of contact for those with a single social contact ( ).

Total ( )Previous ( )Concurrent ( ) valuea

Relationship (%)b
  Family6.922.20.0
  Friend48.377.835.0<0.01
  Coworker37.90.055.0
  Other6.90.010.0
How close (%)c
  Very close50.080.035.00.10
  Somewhat close40.010.055.0
  Not very close10.010.010.0
Race concordant (% yes)87.590.985.70.57
Instrumental to participation (% yes)b66.770.065.00.86

a test for categorical variables bmissing for 3; cmissing for 2.