Baseline Characteristics of Patients Participating in a Trial of Short Message Service Reminders for Seasonal Influenza Vaccination, Western Australia, 2016
| Characteristic | Intervention Group No. (%) | Control Group No. (%) | P Value |
|---|---|---|---|
| Total | 6,177 | 6,177 | |
| Sex | |||
| Male | 2,927 (47.4) | 2,921 (47.3) | |
| Female | 3,241 (52.5) | 3,249 (52.6) | |
| Not provided | 9 (0.1) | 7 (0.1) | .90 |
| Age group, y | |||
| <5 | 1,530 (24.8) | 1,487 (24.1) | |
| 5–17 | 403 (6.5) | 380 (6.1) | |
| 18–64 | 2,463 (39.9) | 2,478 (40.1) | |
| ≥65 | 1,781 (28.8) | 1,832 (29.7) | .20 |
| Race | |||
| Indigenous | 480 (7.8) | 517 (8.4) | |
| Non-Indigenous | 2,979 (48.2) | 3,004 (48.6) | |
| Not indicated in patient record | 2,718 (44.0) | 2,656 (43.0) | .34 |
| Preexisting chronic medical conditions | |||
| Diabetes | 874 (14.1) | 876 (14.2) | |
| Chronic heart disease | 387 (6.2) | 421 (6.8) | |
| Asthma | 1,935 (31.3) | 1,875 (30.3) | |
| Chronic obstructive pulmonary disease | 179 (2.9) | 169 (2.7) | |
| Impaired immunity | 148 (2.4) | 132 (2.1) | .58 |
| Pregnanta | |||
| Yes | 124 (14.9) | 115 (13.3) | |
| No | 709 (85.1) | 747 (86.7) | .47 |
| Record of influenza vaccine with practice | |||
| Yes | 1,998 (32.3) | 2,011 (32.6) | |
| No | 4,179 (67.7) | 4,166 (67.4) | .80 |
↵a Among reproductive women aged 19 to 44 years (n = 833 in intervention group; n = 862 in control group).