Table 1

 Details of sampling frame and response rates

Number of CCDsLow income households Mean (range)Adults sampled (n)Response rate (%)Final sample size
Stratum 1 (high SES)177.0 (3.5–8.5)135562.1842
Stratum 4 (mid SES)1615.3 (14.3–16.7)134759.0795
Stratum 7 (low SES)1731.4 (24.1–59.6)130354.6712
Total5017.8 (3.5–59.6)400558.72349