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TABLE 3

Rate of Expected Secondary Infections per 100 Primary Cases (95% CI), by Grade Level

Grade LevelPresurge Secondary Infections per 100 Primary Cases (95% CI)Post SurgePost Surge Without Sports
Elementary 6.51 (3.70–11.5) 4.43 (2.82–6.96) 4.43 (2.91–6.75) 
Middle 4.48 (1.73–11.6) 2.68 (1.25–5.75) 2.68 (1.31–5.47) 
High 1.57 (0.49–5.06) 3.92 (2.36–6.51) 1.05 (0.42–2.63) 
Grade LevelPresurge Secondary Infections per 100 Primary Cases (95% CI)Post SurgePost Surge Without Sports
Elementary 6.51 (3.70–11.5) 4.43 (2.82–6.96) 4.43 (2.91–6.75) 
Middle 4.48 (1.73–11.6) 2.68 (1.25–5.75) 2.68 (1.31–5.47) 
High 1.57 (0.49–5.06) 3.92 (2.36–6.51) 1.05 (0.42–2.63) 
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