Table 2: Results of nonadjusted multilevel analysis model of poisson log-linear regression for prevalence of periodontal condition (calculus and/or bleeding). Goiania, Brazil, 2010.

Regression coefficient Standard error Prevalence ratio Confidence interval 95% Contextual variables              District I — — 1.000 — — —  District II 0.3140 0.0840 1.369 1.161 1.614 0.000*  District III 0.4180 0.2850 1.519 0.869 2.655 0.143  Private school — — 1.000 — — —  Public school 0.4320 0.1540 1.540 1.139 2.083 0.004*  School toothbrushing program               Yes — — 1.000 — — —   No 0.1260 0.1780 1.134 0.800 1.608 0.477 Individual variables              Female — — 1.000 — — —  Male 0.2660 0.1490 1.305 0.974 1.747 0.074  White — — 1.000 — — —  Black −0.0260 0.3550 0.974 0.486 1.954 0.943  Brown 0.5180 0.2560 1.679 1.016 2.773 0.043*  Mother’s schooling (years)               More than 11 — — 1.000 — — —   8 to 11 0.1370 0.2340 1.147 0.725 1.814 0.558   Less than 8 0.3900 0.3770 1.477 0.705 3.092 0.301

* .