SARS-CoV-2 incidence, secondary attack rate (SAR), effective reproductive number (R*) and percentage of positive tests by school year
| Year (age in years) | SARS-CoV-2 incidence (95% CI) | SAR Mean (SD) | SAR Median (IQR) | R* (95% CI) | % of positive tests (95% CI) |
| P3 (3) | 1.74% (1.63 to 1.85) | 2.34% (5.53) | 0.00 (0.00–0.00) | 0.42 (0.35 to 0.49) | 3.26 (3.06 to 3.45) |
| P4 (4) | 2.31% (2.19 to 2.43) | 2.77% (6.55) | 0.00 (0.00–4.17) | 0.54 (0.46 to 0.61) | 4.89 (4.65 to 5.12) |
| P5 (5) | 3.10% (2.97 to 3.23) | 4.59% (9.30) | 0.00 (0.00–5.00) | 0.93 (0.82 to 1.04) | 6.82 (6.55 to 7.10) |
| 1 (6) | 3.54% (3.40 to 3.68) | 4.36% (8.38) | 0.00 (0.00–5.00) | 0.90 (0.81 to 0.99) | 7.98 (7.69 to 8.27) |
| 2 (7) | 4.12% (3.97 to 4.27) | 4.92% (8.95) | 0.00 (0.00–5.88) | 1.00 (0.91 to 1.08) | 8.67 (8.38 to 8.96) |
| 3 (8) | 4.61% (4.45 to 4.77) | 5.57% (9.52) | 0.00 (0.00–7.62) | 1.15 (1.05 to 1.24) | 9.09 (8.80 to 9.37) |
| 4 (9) | 5.17% (5.01 to 5.33) | 6.10% (9.76) | 0.00 (0.00–8.33) | 1.30 (1.20 to 1.39) | 10.02 (9.74 to 10.31) |
| 5 (10) | 5.51% (5.35 to 5.67) | 6.06% (9.86) | 0.00 (0.00–8.33) | 1.29 (1.20 to 1.38) | 9.55 (9.29 to 9.81) |
| 6 (11) | 5.91% (5.74 to 6.08) | 7.17% (11.8) | 3.85 (0.00–9.09) | 1.51 (1.40 to 1.61) | 10.36 (10.09 to 10.63) |