| khid | Household identification number |
| kfid | Fieldwork household identifier |
| kivnadd | Household found at new address in field |
| kivia | Interviewer area |
| kivid | Interviewer number |
| kivlnc | Total calls at last known address |
| kivtnc | Total calls at interview address |
| kiviam | Area intrvw took place non-local movers |
| kivfho | Final household interview outcome |
| kivosmrh | No. OSMs – whole HH refusal to intervwr |
| kivnsmrh | No. new HH membs – whl HH ref to intvwr |
| kivrrefh | Reason for household refusal |
| kivisst | Coversheet issue status |
| kivconv | Refusal conversion attempted |
| kivreis | Re-issued to field |
| khhdc | Document check – h/hold quest’re comp? |
| khhorig | Sample Origin: original BHPS or ECHP |
| kxhwght | Household Weight |
| kregion | Region / Metropolitan area |
| khhmove | Mover household indicator |
| ahid | Household identification number – Wave 1 |
| kxhwghte | ECHP Household weight |
| kxhwtuk1 | Household weight -inc all samples |
| kxhwtuk2 | Household weight -within UK estimates |
| kstrata | Stratification class |
| kpsu | Primary Sampling Unit |
| kregion2 | Government Office Region |