The combined model (considering all two-way interaction
effects within and between risk factor categories) was found to
have an adjusted R2 of 0.89. All of the main effects and several
interactions between categories were included in the model
(Table 10). Several cross-category interactions were found such as
gender by PSS, vibration by PSS, age by force, age by repetition, BMI
by force, BMI by repetition, BMI by vibration, family history by
repetition, physical activity by force, smoking by posture, and
smoking by repetition. Among the main effects, vibration was
found to have a large coefficient. Interactions of BMI with force,
repetition, and vibration; physical activity with family history,
smoking and force; and smoking with posture were also found to
have large coefficients.
The interaction effect of vibration by PSS was included in the
model first and explained 32% of the variance. Alcoholwas included
next and explained 7%, family history by physical activity next explaining 8% and of the variance in the model predicting LBP
severity (Table 11). Table 11 shows the partial R2 values of the
variables included in the model in the order entered
The combined model (considering all two-way interactioneffects within and between risk factor categories) was found tohave an adjusted R2 of 0.89. All of the main effects and severalinteractions between categories were included in the model(Table 10). Several cross-category interactions were found such asgender by PSS, vibration by PSS, age by force, age by repetition, BMIby force, BMI by repetition, BMI by vibration, family history byrepetition, physical activity by force, smoking by posture, andsmoking by repetition. Among the main effects, vibration wasfound to have a large coefficient. Interactions of BMI with force,repetition, and vibration; physical activity with family history,smoking and force; and smoking with posture were also found tohave large coefficients.The interaction effect of vibration by PSS was included in themodel first and explained 32% of the variance. Alcoholwas includednext and explained 7%, family history by physical activity next explaining 8% and of the variance in the model predicting LBPseverity (Table 11). Table 11 shows the partial R2 values of thevariables included in the model in the order entered
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