Mullooly 1987
| Methods | Purpose: to compare personalised letter with no intervention Design: RCT, individuals randomised Duration of study: interval between intervention and when outcome was measured: "Kaiser Permanente ...operates seasonal influenza clinics." Power computation: not performed Statistics: percentages | |
| Participants | Country: USA Setting: Kaiser Permanente Northeast Region HMO in Portland, Oregon/Vancouver and Washington metropolitan area Eligible participants: (health status): ≥ 65, discharged alive from hospital October 1983 to September 1984 with diagnoses of cardiovascular, pulmonary, renal, metabolic/nutritional, neurologic or malignant diseases Age: ≥ 65 Gender: intervention 48.1% f; control 52.7% f | |
| Interventions | Intervention 1: personalised recommendation to obtain influenza vaccination, and information about where and when to obtain vaccination Control: no intervention | |
| Outcomes | Outcome measured: % influenza vaccination Time points from the study that are considered in the review or measured or reported in the study: not stated: "Kaiser Permanente ...operates seasonal influenza clinics." % vaccinated by; not stated | |
| Notes | Funding: not stated; we e‐mailed the author for influenza vaccination uptake in the year before the intervention but no reply | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Low risk | "The study group population was randomised into intervention and control groups based on a pseudo random digit of the individual membership ID number." |
| Allocation concealment (selection bias) | Unclear risk | No statement |
| Blinding (performance bias and detection bias) All outcomes | Unclear risk | No statement: "Medical records were retrospectively reviewed at the end of the study period to ascertain whether subjects had received influenza vaccine" |
| Incomplete outcome data (attrition bias) All outcomes | Unclear risk | "Medical records were retrospectively reviewed at the end of the study period to ascertain whether subjects had received influenza vaccine ..." |
| Selective reporting (reporting bias) | Low risk | No selective reporting |