| ahid | Household identification number |
| apno | Person number |
| ahgr2r | Relationship to reference person |
| ahgsex | Sex – HH grid |
| ahgbm | Month of birth – HH grid |
| ahgby | Year of birth – HH grid |
| amastat | Marital status |
| ahgspn | PNO of spouse/partner |
| ahgest | Employment status – HH Grid |
| ahgfno | PNO of father |
| ahgmno | PNO of mother |
| ahgra | Responsible adult |
| ahgcia | Household member absent |
| ahgrab | Reason household member absent |
| aivfio | Individual interview outcome |
| aiodc | Document check |
| pid | Cross-wave person identifier |
| pidp | Cross-wave person identifier (UKHLS) |
| aage | Age at Date of Interview |
| aage12 | Age at 1.12.1991 |
| ahgjnly | Whether joined household since 1.9.90 |
| ahgmjn | Month joined Household |
| ahgyjn | Year joined Household |
| abutype | Benefit Unit Type |
| abuno | Benefit Unit Number |
| anchild | Number of own children in household |
| adepchl | Whether dependent child: DSS definition |
| ahoh | Conventional Head of Household Indicator |
| arach16 | Whether responsible adult for child |
| aagei | Imputation flag – AAGE and AAGE12 |
| axewght | X-sectional enumerated individual weight |
| asppid | Cross-wave person identifier of spouse |
| afpid | Cross-wave person identifier of father |
| ampid | Cross-wave person identifier of mother |
| arapid | X-wave person identifier of resp. adult |
| abuid | BU identifier |
| aecstat1 | Econ.Status BU (HBAI defn), i |
| aecstat2 | Econ.Status BU (HBAI defn), ii |
| afamtype1 | BU type (HBAI defn) |
| afamtype2 | Family type – new HBAI definition |
| abutype_mod | benefit unit type |