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A plot of predicted transition probabilities for sites that were healthy at 6 months based on CAL + BOP classification. Here, states 1, 2 and 3 correspond to healthy, gingivitis and chronic periodontitis. Transition probabilities (1 → 3) were higher than for PD + BOP (see Fig.3). BOP, bleeding on probing; CAL, clinical attachment level; PD, pocket depth.
