Table 1.

Response rate

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%