Table 2

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)