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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%)