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. 2015 Mar 26;10(3):e0122568. doi: 10.1371/journal.pone.0122568

Table 2. Model output for the likelihood of keel bone fractures occurring.

Likelihood of keel bone fracture (binary)
Term Estimate SE Ref
β0 -5.7 0.45
Hybrid 0.82 0.29 ISA
Age 0.19 0.02
Perch type -0.43 0.12 soft
Hybrid: Perch type -0.02 0.01

For this analysis, the category in the `Ref`column serves as the reference from which the other category is compared against (Hybird ISA vs. DW; Perch type soft vs. hard).