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Table 6 Multivariate negative binomial regression coefficients (b), their standard errors, exponentiated coefficients with 95% confidence intervals (CI) for the summary quality of life score, according to categories of potential predictors*, among all participants (Weighted N = 1807)

From: Association between gingival parameters and Oral health–related quality of life in Caribbean adults: a population-based cross-sectional study

Predictors b SE p-value exp(b) 95% CI
Age, years −0.008 0.002 0.001 0.992 (0.988; 0.997)
Gender
 Male vs. Female (ref.) −0.263 0.053 < 0.001 0.769 (0.693; 0.853)
Level of education
 None/basic 0.019 0.094 0.840 1.019 (0.847; 1.227)
 Middle/technical −0.017 0.068 0.799 0.983 (0.860; 1.123)
 University (ref.)   
Smoking
 Current 0.287 0.068 < 0.001 1.332 (1.166; 1.522)
 Past −0.002 0.076 0.974 0.998 (0.860; 1.157)
 Never (ref.)
Any diseases/conditions
 Yes vs. No (ref.) 0.187 0.057 0.001 1.205 (1.078; 1.348)
Number of missing teeth 0.032 0.006 < 0.001 1.033 (1.020; 1.045)
Mean gingival index 0.367 0.070 < 0.001 1.444 (1.259; 1.656)
Mean plaque index −0.012 0.197 0.951 0.988 (0.672; 1.453)
Mean calculus index −0.008 0.089 0.925 0.992 (0.833; 1.180)
Frequency of dental visits
  ≥ Once per year (ref.)
 Never 0.131 0.160 0.411 1.140 (0.833; 1.180)
 Only when there is a problem 0.211 0.073 0.004 1.234 (1.071; 1.423)
 Missing 0.201 0.140 0.151 1.223 (0.929; 1.610)
Use of dental floss
 Yes vs. No (ref.) −0.061 0.059 0.301 0.941 (0.838; 1.056)
Location
 Kingston −0.304 0.094 0.001 0.738 (0.613; 0.888)
 Santo Domingo −0.039 0.080 0.625 0.962 (0.822; 1.125)
 San Juan (ref.)