| Sample size | 54,964 | 2,709,742 | 4,068,251 |
| Patient | | | |
| Sex | | | |
| Male | 49.5% | 49.5% | 48.9% |
| Female | 50.5% | 50.5% | 51.1% |
| Age groups (as of 31 March 2016) | | | |
| <1 | 5.4% | - | - |
| 1–4 | 33.6% | 12.8% | 15.4% |
| 5–9 | 30.0% | 18.3% | 19.6% |
| 10–14 | 20.9% | 20.9% | 19.9% |
| 15–19 | 10.1% | 24.2% | 22.0% |
| Neighbourhood income quintile | | | |
| 1 – Lowest income | 15.6% | 18.2% | 19.6% |
| 2 | 17.5% | 18.7% | 18.5% |
| 3 | 21.2% | 20.4% | 19.5% |
| 4 | 21.9% | 21.9% | 20.8% |
| 5 – Highest income | 22.5% | 20.5% | 19.7% |
| Unknown | 684 | 0.4% | 2.0% |
| Rurality | | | |
| Rural | 18.7% | 11.6% | 10.6% |
| Urban | 81.4% | 88.3% | 87.8% |
| Unknown | | 0.1% | 1.6% |
| Physicians (N = 355) | | | |
| Years on EMR (mean) | 7.44 | | |
| Range | 0.2–25 | | |
| Practices (N = 41) | | | |
| Practice size (patient volume) | | | |
| Small < 5000 | 36.6% | | |
| Medium 5000–10,000 | 34.2% | | |
| Large > 10,000 | 29.3% | | |
| Proportion of pediatric patients | | | |
| Mean % | 18.2% | | |
| Range | 9.0%–28.0% | | |