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Table 1 Description of sample response rates

From: Influence of social support on cognitive function in the elderly

No. of questionnaires sent out

6367

No. interviews completed and suitable for analysis

4993 (78%)

Interviews not completed or excluded from analysis because of:

 

   Death

42

   Not contactable (e.g. change of address)

742

   Refusal

76

   Excluded because of dementia

4

   Excluded because of other serious psychiatric disease

46

   Proxy interview only

82

   Too many missing items on interview

386

Total interviews not completed or used in analysis

1378 (22%)