Table 5.

Procedures of data collection and entry in the SALT Osteoporosis Study

Data collection

Sending of questionnaire by mail

If no reply: repeated sending of questionnaire

If no reply: sending of abbreviated questionnaire

If no reply: follow-up calls by phone

Data entry

Entry of the data in the database in duplo by different administrators

If mismatch: checking of data by third person

If missing data on important questions: follow-up calls by phone  If reported rheumatoid arthritis or prednisone use (first questionnaire): verification at general practitioner