Risk factors for pneumococcal co-colonization in univariate and multivariate analysis.

cFisher's exact test (Monte Carlo estimation with 10,000 simulations), except when indicated.dMultivariate logistic regression.eKolmogorov-Smirnov test.fnot available for variables that are continuous or have more than two classes.gtest applied to all day-care centers simultaneously.hresults are only shown for unit F as the results for other units were not significant.iincludes unvaccinated children from pre-PCV7 and PCV7 era.