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Table 5 Model simplification by backwards stepwise selection of multivariable binary logistic model to assess effects of personal and professional characteristics on the probability of working less-than-full-time, 10 years post-graduation, for male doctors selection

From: Factors associated with less-than-full-time working in medical practice: results of surveys of five cohorts of UK doctors, 10 years after graduation

Model selection steps

Terms/terms removed

Wald’s testa

  

χ 2

df

P

1 (Full model)

Cohort+Specialty+JobGrade+Spouse+Intercalated Degree+Graduate+Specialty*JobGrade+Specialty*Graduate+Specialty*Spouse+Graduate*Spouse

   

2

- Graduate*Spouse

0.02

1

0.88

3

- Specialty*Graduate

3.00

3

0.39

4

- Specialty*Spouse

3.40

3

0.34

5

- Intercalated Degree

0.07

1

0.79

6

- Specialty*JobGrade

11.5

6

0.07

  1. aResults of Wald’s test for removal of specified model term from the model