Table 1.
Summary of the study data. Measles-mumps-rubella (MMR) vaccinations were grouped into MMR-1 (15-month-old children) and MMR-2 (12-year-old children).
| Variable | Value | |
| MMR-1 |
|
|
|
|
Number of vaccinations | 1,098,389 |
|
|
Age (years) at vaccination, mean (SD)a | 1.7 (1.4) |
| MMR-2 |
|
|
|
|
Number of vaccinations | 1,108,205 |
|
|
Age (years) at vaccination, mean (SD)a | 12.3 (1.8) |
| Reported measles cases |
|
|
|
|
Number of cases | 334 |
| Media coverageb |
|
|
|
|
All media, N | 1622 |
|
|
National media, n (%) | 390 (24.0) |
| Analysis of all media content |
|
|
|
|
Relevant to MMRc, N | 681 |
|
|
Provaccination, n (%) | 430 (63.1) |
|
|
Neutral, n (%) | 500 (73.4) |
|
|
Antivaccination, n (%) | 72 (10.6) |
aThe dataset for MMR-1 (targeted 15-month-old children) and MMR-2 (targeted 12-year-old children) only contains age at vaccination in years. This should be considered when interpreting the mean age (SD).
bMedia coverage is quantified as the number of news items containing MMR related keywords over the 18-year study period.
cThis row denotes the number of news items that have been labeled as either provaccination, neutral or antivaccination. A news item can get more than one label; hence, the numbers do not sum to 681.