Figure 2.

Comparison of dietary protein levels with probing depth after non-surgical periodontal therapy in patients who (a) did not smoke and (b) did smoke. Model 1 is unadjusted. Model 2 adjusted for baseline probing depth, hygienist and time between treatment and follow-up. Model 3 adjusted for variables in Model 2 plus age, sex, BMI, flossing frequency and bleeding on probing. Data presented are estimated marginal means ± SEM. * Indicates a significant difference between groups (p < 0.05), ** indicates a significant difference between the two levels of protein intake (p < 0.01).