6 Model Description Generalized linear mixed models (GzLMM) with a random intercept is expressed as: Logit [E (Y ij =1| b i )] = ß 0 + ß 1 X ij1 + ß 2 X ij2 + ß 3 X ij3 +b i Y ij indicates whether the agricultural activity-related injury happened or not in 1999 for the jth person in the ith family b i is the random effect for the ith family X ijk indicates gender, age, education, marital status, prior injury, working hours on the farm and the percentage of prior injury within the family (PPI).
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