Validity of Roger's Diffusion of Treatment Innovation for Pregnant Smokers
Open AccessThe current research study aimed at developing an instrument to measure perceived attributes of using an innovation in a public health system. In this study, the innovation was a behavioral program (Smoking Cessation and Reduction In Pregnancy Treatment -- SCRIPT) to help pregnant mothers quit smoking and the public health system is the West Virginia (WV) Right From the Start Project. WV has a very high smoking rate amongst their pregnant women (27.1%) compared to the national rate (10.2%). The Designated Care Coordinators (DCCs) provide the SCRIPT program to the RFTS clients to help them quit smoking. A measurement tool was developed to measure the perceived attributes of using the SCRIPT program by the DCCs. This instrument (SCRIPT Adoption Survey - SAS) was developed to address the five constructs of Rogers Diffusion of Innovation model: Relative Advantage, Compatibility, Complexity, Observability, and Trialability. The instrument was tested for its validity and reliability. Forty three items were administered to the DCCs. Twenty Eight of these 43 items were found to be reliable and valid. The internal consistency of the full scale was 0.926 and test retest reliability was 0.756 (p<0.0001). The internal consistency of the sub-scales ranged from 0.667 to 0.879. The test-retest reliability of the sub-scales ranged from 0.599 to 0.737. The lowest reliability was found in the Observability domain. All items had a factor loading of greater than 0.4 (0.43-0.81). Model Fit statistics were not conclusive; however, the Akaike Information Criterion (AIC) was smallest in the hypothesized model. Correlation between SAS score and implementation rate measured by Program Implementation Index (PII) was 0.336 (p=0.0028); which will explain 11.29% of variation in the implementation rate. Trialability had the highest correlation of 0.391 (p=0.0004) explaining 15.29% of variance in the data.
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