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Table 1 Response rate

From: Self-reported chronic diseases and health status and health service utilization - Results from a community health survey in Singapore

Total no. of housing units in 4 blocks 931
Household survey:  
- vacant (excluded) 39
No. of units visited 892
- no answer after 3 visits 168
- refused 166
No. of units agreed to participate (a) 558
Household response rate 558/(892) = 62.6%
Individual survey:  
Total no. of residents in (a) 1,145
- eligible 974
- refused 109
- not contactable after 3 attempts (excluded) 87
No. of residents successfully surveyed 778
Individual response rate 778/974 = 79.9%
Overall response rate 62.6% x 79.9% = 50.0%