Table 4

Analysis of variance of appendicitis occurrence as a function of classification to risk categories (Level) by different Diagnostic types (Alvarado and AIR)

SourceSSdf F P value
Diagnostic4.3014.2480.0399
Level92.02245.434<2e-16
Diagnostic*Level1.9720.9740.378
Residual478.00472
  • The response variable is a binary measure of positive versus negative appendicectomy results. The model is a generalized linear model with binomial response errors. Tests are type II sums of squares.

  • AIR, Appendicitis Inflammatory Response.