English to Russian Other Mathematics & Statistics

P values for unmatched comparisons of groups were assessed with the chi-square test for categorical data and Student’s t-test for continuous data.23,24 Maximum-likelihood estimates (with approximate 95 percent confidence intervals) of the matched odds ratios for the association between serious pneumococcal infection and previous immunization with pneumococcal vaccine were calculated from analyses of matched data.24 McNemar’s chi-square tests were used to estimate P values for odds ratios.24 The vaccine’s aggregate protective efficacy was calculated as a percentage: