The gingival index (GI) and the Orogranulocytic Migratory Rate (OMR) were determined for 86 subjects. The statistical analyses revealed a highly significant correlation between the two parameters. An analysis of regression demonstrated that the correlation of GI and OMR changed with low to high values of GI, probably because GI is not a true parametric index.
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Skougaard et al. (1969) studied this question.
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