The absolute numbers of participants in each cell of the cross tabulation by test and criterion status, that is true positive, false negative, false positive and true negative.
Associations with socio-demographic and work-related determinants were tested using cross-tabulations, χ2 test and linear trend test where appropriate.
Adjusted estimates for sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and referral rates were calculated from cross-tabulation of test results and adjusted end points.
Cross tabulations and test statistics (Chi square and Mid-P exact) of the Open Epi software [ 15] were used to compare results and evaluate associations.
Cross tabulations were tested by Chi-square statistics.
* all cross-tabulation χ2 tests with p < 0.001 ** Classified according to reference quintiles estimated for Pelotas.
Univariable associations between VA and falls with potential covariates were explored using linear regression, tabulation and χ test.
Results were reported as frequency, and for comparing the before and after intervention's results, we used cross tabulation and χ test.
Cross tabulation and chi-square test or Fisher's exact test were used to test the significance of the univariable associations between the explanatory variables and the outcome variable.
Statistical methods applied were frequencies, cross-tabulations and χ test.
