Table 1

The characteristics of enrolled participants, compared with those approached but not enrolled, in Suzhou and Yancheng

EnrolledApproached but not enrolled*p Value
(n=1532)(n=748)
n (%)n (%)
Sex
 Male680 (44.4%)327 (43.7%)0.80
 Female852 (55.6%)421 (56.3%)
Age group, in years
 <600 (0)31 (8.1%)<0.01
 60–69548 (35.8%)110 (28.8%)
 70–79518 (33.8%)125 (32.7%)
 80–89466 (30.4%)110 (28.8%)
 ≥900 (0)6 (1.6%)
Self-reported health status
 Excellent27 (1.8%)1 (0.3%)<0.01
 Very good316 (20.6%)14 (4.4%)
 Good581 (37.9%)41 (13%)
 Fair554 (36.2%)175 (55.6%)
 Poor54 (3.5%)84 (26.7%)
Heard of influenza vaccine
 Yes344 (22.5%)16 (5.1%)<0.01
 No1188 (77.5%)299 (94.9%)
Self-reported ever received influenza vaccine
 Yes13 (0.8%)2 (0.6%)>0.99
 No†1519 (99.2%)313 (99.4%)
  • *Older adults approached but not enrolled were excluded at multiple stages. Therefore, the total numbers in each category do not always add up to 748, but reflect the numbers of the approached/screened who have responded to the specific question.

  • †Older adults who have not heard of influenza vaccine were assumed to have never received influenza vaccine.