| COHORT | cohort |
| IS11 | other problems during SP interview? |
| IS13 | amount of questions SP understood |
| IS14 | gender of SP |
| IS16 | age cohort of SP |
| IS1A | SP description 1 |
| IS1B | SP description 2 |
| IS1C | SP description 3 |
| IS1D | SP description 4 |
| IS1E | SP description 5 |
| IS2 | SP likelihood of participating next year |
| IS20 | location of interview |
| IS20A | other's home location |
| IS20B | other location |
| IS21 | interview completed? |
| IS22 | reason interview discontinued |
| IS22B | explanation of SP not understanding |
| IS4 | likelihood of locating SP next year |
| IS6 | language of Wave 2 SP interview |
| IS6A | more than 1 language of SP interview |
| IS6B | SP language English with help |
| IS7 | communication w/SP impaired by language? |
| IS9 | problems due to presence of others? |
| SUBID2 | ICPSR Wave 2 subject ID |
| WAVE | wave # |