| nhid | Household identification number |
| nfid | Fieldwork household identifier |
| nivnadd | Household found at new address in field |
| nivia | Interviewer area |
| niviam | Area intrvw took place non-local movers |
| nivid | Interviewer number |
| nivlnc | Total calls at last known address |
| nivtnc | Total calls at interview address |
| nivfho | Final household interview outcome |
| nivosmrh | No. OSMs – whole HH refusal to intervwr |
| nivnsmrh | No. new HH membs – whl HH ref to intvwr |
| nivrrefh | Reason for household refusal |
| nivconv | Refusal conversion attempted |
| nivreis | Re-issued to field |
| nivisst | Coversheet issue status |
| nivovt | Original voucher type |
| nivavt | Actual voucher type |
| nhhdc | Document check – h/hold quest’re comp? |
| nhhorig | Sample Origin |
| nxhwght | Household Weight |
| nregion | Region / Metropolitan area |
| nhhmove | Mover household indicator |
| ahid | Household identification number – Wave 1 |
| nxhwtuk1 | Household weight -inc all samples |
| nxhwtuk2 | Household weight within UK estimates |
| nstrata | Stratification class |
| npsu | Primary Sampling Unit |
| nregion2 | Government Office Region |