Table 1

Baseline Characteristics of Study Patients and Comparison of Patients Followed up and Lost to Follow-up.

CharacteristicsPatients in Original Trial
N = 431
Patients Available for Follow-up
n = 379
Patients Lost to Follow-up n = 52P Valuea
Women, No. (%)265 (61.5)235 (62.0)30 (57.7).55
Age, mean (SD), y49.9 (15.3)49.9 (15.0)49.8 (17.6).93
Comorbidity at index visit, No. (%)
  COPD31 (7.2)24 (6.3)7 (13.5).06
  Asthma39 (9)31 (8.2)8 (15.4).09
Antibiotics prescribed, No. (%)
  At index visit of trial178 (41.3)160 (42.2)18 (34.6).30
  During 28-day follow-up of trial221 (51.3)197 (52.0)24 (46.2).43

Note: data in this table represent information recorded during the index visit and 28-day follow-up of the original trial.

  • COPD = chronic obstructive pulmonary disease.

  • a P values come from Mann-Whitney test (age) or χ2 test (other variables) comparing those available for follow-up with those lost to follow-up.