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. Author manuscript; available in PMC: 2012 Jul 9.
Published in final edited form as: J Am Geriatr Soc. 2010 Nov 4;58(12):2401–2406. doi: 10.1111/j.1532-5415.2010.03162.x

Table 3.

Confirmatory Tests of Mediation for Practice Environment and Pressure Ulcers

Equation Mediator IV DV β P-Value
1 Practice environment Profit status – 0.28 .03
2 Profit status Pressure ulcer prevalence 0.29 .03
3 Practice environment Pressure ulcer prevalence – 0.31 .02
Profit status Pressure ulcer prevalence 0.21 .11

Note: Practice environment scores indicate extent to which respondents agree that supportive traits are present (range 1 (strongly disagree) to 4 (strongly agree), with higher scores indicating more-supportive environments).Tests for mediation.

Equation 1. Independent variable (IV) must be a significant predictor of mediator.

Equation 2. IV must be a significant predictor of dependent variable (DV).

Equation 3. Entering the mediator and IV in the equation, the mediator must be a significant predictor of the DV, and the effect of the IV on the DV must be reduced or not significant.