The main survey questions about diagnoses of health conditions remained close to static for the first nine waves of the main survey. At Wave 10 and then again at Wave 14 of the main survey the question wording changes about whether a doctor had ever diagnosed mental health conditions. Reviewing the data, there is some evidence that the change in wording has resulted in changes in prevalence. This experiment compares the three versions of asking the questions, pre-Wave 10, with Wave 10 changes, and the Wave 14 changes (current version). The treatment allocation variable, allocated at the household level, with one-third of the sample allocated to each version of the questions, is in file p_hhsamp_ip:
ff_mhealthexpw16 (1/3 each, allocation stratified by sampleorig ff_numeracyw16 ff_climatechangew16 ff_gridmodew16 ff_incentw16)
1 = Wave 8 version
2 = Wave 10 version
3 = Wave 14 version
The variables affected by this experiment are in file p_indresp_ip:
ahconda*, hcondsa*, hcondaa*, hcondb*, arthtypb, cancertypb*, diabetestypb, mhealthtypb*, hcondcodeb*, hcondab*, hcondsb*, mhcondc*, hcondc?, hcondc??, arthtypc, cancertypc*, diabetestypc, brainnervtypc*, spleenoutc, hcondcodec*, hcondac*, hcondsc*
