| PrevIWMonth | INTERVIEW MONTH PREVIOUS WAVE NUMBER 1-12 | INTERVIEW MONTH PREVIOUS WAVE NUMERIC |
| a007 | R ALIVE | R ALIVE |
| a009 | R SELF INTERVIEW | R SELF INTERVIEW |
| preload_A070 | R owns or rent besides nursing home previous wave | R owns or rent besides nursing home previous wave |
| preload_A079_ | preload_A079_: any other house or apt from previous wave | A079_ preload |
| preload_A167 | R in nursing home previous wave | R in nursing home previous wave |
| preload_a085 | which main residence previous wave | which main residence previous wave |
| preload_x060 | PREVIOUS WAVE PERSON SEX_OF_INDIVIDUAL | PREVIOUS WAVE PERSON SEX_OF_INDIVIDUAL |
| preload_x065 | PREVIOUS WAVE PERSON COUPLENESS_STATUS_OF_INDIVIDUAL | PREVIOUS WAVE PERSON COUPLENESS_STATUS_OF_INDIVIDUAL |
| preload_x067 | PREVIOUS WAVE year born | PREVIOUS WAVE year born |
| previous_endtime | | time at which hrs wave 2 T was finished |
| previous_wave | Indicates what the previous wave was | indicates what the previous wave was |
| previous_z076 | Indicates if the previous interview was a reinterview | indicates if previous interview is reinterview |
| x024 | indicates reinterview | indicates reinterview |
| z076 | Indicates if this is a reinterview | indicates reinterview |
| z092 | INTERVIEW MONTH PREVIOUS WAVE STRING | INTERVIEW MONTH PREVIOUS WAVE |
| z092_temp | begintime wave 2 | begintime wave 2 |
| z093 | INTERVIEW YEAR PREVIOUS WAVE | INTERVIEW YEAR PREVIOUS WAVE |