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Table 4 Nonlinear effects for age at examination and trends by exposure group estimated by smoothed terms

From: Comparative effectiveness of school-based caries prevention: a prospective cohort study

  TOCE Untreated decay (permanent teeth)
Smoothing Terms (GAMs) edf p edf p
 Age at exam 2.94 < .001 3.85 < .001
 Visit among unexposed 2.30 < .001 1.00 0.02
 Visit among exposed 3.46 < .001 1.12 < .001
  1. Note: increased magnitude of effective degrees of freedom (edf) indicates greater departures from linearity
  2. TOCE total observed caries experience, GAM generalized additive models