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Serum antibody levels to P. gingivalis GroEL at baseline examination and reassessment. Data are determined by ELISA using recombinant P. gingivalis GroEL as an antigen (box plots show medians, 25th and 75th percentiles as boxes, 10th and 90th percentiles as whiskers. Outside values are shown as open circles). *Significant difference was observed between baseline examination and reassessment (paired t-test, P = 0·0015).
