Table 1: Temporal trends in immunization exemptions to measles-containing vaccine among 17-year-old students in Ontario during the 2002/03 to 2012/13 school years, by exemption classification | School year | Proportion of students, % |
|---|
| Medical exemptions | Prior immunity | Religious or conscientious exemptions | Total exemptions |
|---|
| 2002/03 | 0.82 | 0.47 | 0.58 | 1.88 |
| 2003/04 | 0.74 | 0.47 | 0.74 | 1.95 |
| 2004/05 | 1.14 | 0.47 | 0.67 | 2.27 |
| 2005/06 | 0.76 | 0.39 | 0.93 | 2.08 |
| 2006/07 | 0.91 | 0.39 | 0.88 | 2.21 |
| 2007/08 | 0.72 | 0.31 | 1.11 | 2.14 |
| 2008/09 | 0.62 | 0.22 | 1.17 | 2.01 |
| 2009/10 | 0.54 | 0.16 | 1.16 | 1.86 |
| 2010/11 | 0.14 | 0.13 | 0.96 | 1.23 |
| 2011/12 | 0.17 | 0.12 | 0.95 | 1.23 |
| 2012/13 | 0.19 | 0.12 | 1.09 | 1.39 |
| p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 |