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Table 1 Stage I and II: sample characteristics by country

From: Development of the Flu-PRO: a patient-reported outcome (PRO) instrument to evaluate symptoms of influenza

Characteristics Stage I (N = 46) Stage II (N = 34)
US (n = 16) Mexico (n = 30) US (n = 12) Mexico (n = 22)
Age (years)
Mean (SD) 38.4 (18.8) 39.0 (13.5) 37.0 (14.1) 38.6 (11.4)
Range 19.0–84.0 22.0–67.0 22.0–65.0 23.0–55.0
Gender (N, %)
Female 9 (56.3) 22 (73.3) 6 (50.0) 11 (50.0)
Ethnicity (N, %)
Not Hispanic or Latino 15 (93.8) 0 (0.0) 11 (91.7) 0 (0.0)
Hispanic or Latino 1 (6.3) 30 (100.0) 1 (8.3) 22 (100.0)
Race (N, %)a
American Indian or Alaska Native 3 (18.8) 0 (0.0) 0 (0.0) 0 (0.0)
Asian 2 (12.5) 0 (0.0) 1 (8.3) 0 (0.0)
Black or African American 2 (12.5) 0 (0.0) 4 (33.3) 0 (0.0)
White 11 (68.8) 1 (3.3) 7 (58.3) 0 (0.0)
Mestizo 1 (6.3) 29 (96.7) 0 (0.0) 22 (100.0)
Other 2 (12.5) 0 (0.0) 0 (0.0) 0 (0.0)
Educational status adults (N, %)
Less than high school 0 (0.0) 4 (13.3) 0 (0.0) 0 (0.0)
High school graduate or equivalent 1 (6.3) 8 (26.7) 1 (8.3) 4 (18.2)
Some college or university, bachelor’s degree, or post graduate education 15 (93.8) 18 (60.0) 11 (91.7) 15 (68.2)
Other 0 (0.0) 0 (0.0) 0 (0.0) 3 (13.6)
Time interval to interview (mean days, SD)
First notice symptoms to interview 5.4 (2.3) <7 12.1 (4.3) 10.8 (9.9)
First notice symptoms to clinic visit 1.8 (1.2) <7 2.7 (2.9) 4.0 (4.5)
Clinic visit to interview date 3.6 (2.0) <7 9.4 (3.7) 6.8 (7.4)
Medications for influenzaa(N, % Yes)
None 1 (6.3) 0 (0.0) 2 (16.7) 0 (0.0)
Oseltamivir (Tamiflu) 8 (50.0) 15 (50.0) 6 (50.0) 9 (40.9)
OTC symptom relief 13 (81.2) 0 (0.0) 0 (0.0) 0 (0.0)
Other 0 (0.0) 0 (0.0) 9 (75.0) 19 (86.4)
Health conditions (N, %)
None 9 (56.3) 18 (60.0) 4 (33.3) 13 (59.1)
Asthma or other lung condition 0 (0.0) 0 (0.0) 3 (25.0) 7 (31.8)
Depression 0 (0.0) 0 (0.0) 2 (16.7) 0 (0.0)
Diabetes 1 (6.3) 5 (16.7) 1 (8.3) 0 (0.0)
Heart attack/angina 0 (0.0) 0 (0.0) 1 (8.3) 0 (0.0)
Hypertension 1 (6.3) 0 (0.0) 4 (33.3) 2 (9.1)
Kidney disease 0 (0.0) 0 (0.0) 2 (16.7) 0 (0.0)
Lung disease 0 (0.0) 0 (0.0) 1 (8.3) 0 (0.0)
Osteoporosis 1 (6.3) 0 (0.0) 1 (8.3) 0 (0.0)
Raised cholesterol 1 (6.3) 0 (0.0) 2 (16.7) 0 (0.0)
Stomach ulcer 1 (6.3) 0 (0.0) 0 (0.0) 0 (0.0)
Tuberculosis 1 (6.3) 0 (0.0) 0 (0.0) 0 (0.0)
Other health conditions 6 (37.5) 0 (0.0) 4 (33.3) 3 (13.6)
Cardiovascular disorder 0 (0.0) 4 (13) 0 (0.0) 0 (0.0)
  1. Abbreviations: OTC over the counter; aParticipants could choose more than one response