Table 4 Identification of problems in the questionnaire
Category | Round 1 | Round 2 | Round 3 | Round 4 |
|---|---|---|---|---|
Comprehension | More than one (1) | On the same side of the family (1) Type 1 or type 2 (1) Close relatives (1) | Age limits (1) Same side of the family (1) | – |
Recall | Loss of contact (2) | – | – | – |
Judgement | – | – | – | – |
Response process | Missing category (2) | – | – | – |
Completeness | Open question (2) | Open question (2) | – | – |