Fig 1. Participation in the study at T1 and T2.

Definition of terms: "not eligible" represents people who did not meet selection criterions; "incomplete questionnaires" corresponds to questionnaires with an incomplete section or a section with more than half of the section missing responses; "missing questionnaires" represents the questionnaires lost during recruitment; "invalid questionnaire" represents a questionnaire completed by another person or a questionnaire with two answers to the same question; "missing data" corresponds to a questionnaire without answers at some questions; and "unreachable" represents people whose telephone was out of service when called or the people who did not answer.