Other study variables included occupational and leisure-time physical activity, sleep duration, socioeconomic status, smoking, alcohol consumption, energy intake, adherence to the recommended diet, multiple individual food items, age and genetic variants associated with body mass index (BMI).
The BIPQ can be scored in multiple ways, as individual items, as a score within each of the 4 dimensions, or as a total score [ 41 – 43 ].
To account for non-response to individual items, we employed multiple imputation using the so-called ice and micombine procedures available in Stata 9.2 [ 11, 12].
Individual items have more random variability (measurement error) than multiple-item subscales, which tend to be more reliable and accurate (Sloan et al, 2002).
The items for the summary index were chosen to provide an equal representation of all the multiple measures in the test battery and were chosen before identification of the individual items that were statistically different between the two comparison groups.
The regression weights of the individual items of the respective scales on the latent factors, the squared multiple correlations of the individual item, and the correlations of the latent factors with each other are presented in (Additional file 1: Figure S1) and (Additional file 2: Figure S2).
Past studies have used various methods to assess perceived risk of HIV infection; however, few have included multiple items covering different dimensions of risk perception or have examined the characteristics of individual items.
You can make multiple bundles for packing for a longer trip, using this method to keep the individual items for specific days separate, saving you from having to dig through your bag for the right pair of socks.
Multiple, well-placed distribution centers minimize the time and distance spent on the final leg of delivery, when trucks are often nearly empty while transporting individual items.
