Figure 1.
Flowchart to describe participant recruitment and allocation to questionnaire delivery methods.
Table 1.
Demographic characteristics by questionnaire delivery mode.
Table 2.
Proportion of respondents reporting each socio-economic indicator and risk ratio by questionnaire delivery mode.
Table 3.
Relationship between classification of socio-economic position and questionnaire delivery mode for each socio-economic domain.
Table 4.
Proportion of respondents reporting each socio-economic indicator in each round and the extent of agreement between each round for respondents using IAQ in one round and self-administered in the other.
Table 5.
Proportion of respondents reporting each socio-economic indicator in each round and the extent of agreement between each round for respondents using the same mode of questionnaire delivery in Rounds 1 and 2.
Figure 2.
Association between essential items score for those completing two rounds using different modes each round (n = 131).