In sensitivity analysis, we additionally controlled for mode of survey administration, to evaluate whether this influenced the results.
Results were similar when additionally controlling for mode of survey administration (home visit, telephone, web survey), mitigating concerns that the results are driven by the method of data collection.
The sequential mixed mode appears to be the most cost-effective mode of survey administration for surveys of the population of doctors, if one is prepared to accept a degree of response bias.
** Adjusted for age and mode of survey administration.
After adjusting for differences in mode of survey administration, demographic factors, health need, and how many days patients reported having to wait for an appointment, black, Asian, and Chinese patients' evaluations of waiting times for appointments (both with a particular GP and any GP) remained substantially lower than those of white respondents (table 7, model 4).
We additionally stratified by mode of survey completion to control for mode of administration bias.
We then computed estimates adjusting for respondent age and mode of survey administration.
In addition, scores generated using the post-consultation version of the GPAQ are between 2% and 6% higher than those for the postal version (regardless of whether the latter is administered in surgeries or by mail), 15 so mode of survey administration was adjusted for in all analyses.
All models are based on records with no missing value for Q1, Q2, sex, age, mode of survey administration and HSV-2 seropositivity.
An assessment of the costs associated with each mode of survey recruitment and the expenditure required for each valid survey obtained is shown in Table 2.
