Fig. 2

Adjusted percentage of plaque-free (a), periodontal health (b), and deep pockets (c) in adults aged 25–54 stratified by socioeconomic status from the Dutch National Oral Health Survey 1995–2013. All logistic regression models were adjusted for including age, gender, ethnicity, SES, time since the last dental visit, number of teeth present, and oral hygiene behaviors (toothbrushing frequency, floss usage, and toothpick usage). All P for trends were calculated using survey year as a continuous variable based on the multivariable regression model and with a two-sided significance level of .05