Provide a 95% CI for the true difference in incidence rates for children with siblings between those with and without a sibling history of ear infection?

Otolaryngology

A longitudinal study was conducted among children in the Greater Boston Otitis Media Study [48]. Based on all doctor visits during the first year of life, children were classified as having 1+ episodes vs. 0 episodes of otitis media (OTM). A separate classification was performed for the right and left ears. Several risk factors were studied as possible predictors of OTM. One such risk factor was a sibling history of ear infection, with relevant data displayed in Table 13.50.

Table 13.50 Association between sibling history (Hx) of ear infection and number of episodes of OTM in the first year of life

 

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Group 2 Group 1 Sibling Hx ear infection = yes Left ear Sibling Hx ear infection = no Left ear Right ear Right ear 76 115 20 21 20 77 194 18 91 244 Total Total