Fig. 2

The Odds Ratios (95% Confidence Interval) of having less than 20 natural teeth among different demographic characteristics and multimorbidity groups of older adults in China. The horizontal line (X-axis) represents the 95% confidence interval of the OR value; The center vertical line (OR = 1) serves as a reference line perpendicular to the X-axis, indicating no effect; The small square is positioned at the OR value of the confidence interval.