Nevertheless, the general U.S. population has difficulty with descriptors of physical activity such as 'intensity' [ 47] and there is no reason to believe that that would be any different for Latinos.
Although the difficulties in accurate assessment of physical activity levels in epidemiological studies are well known (IARC Working Group, 2002), there is no evidence that reporting varies by level of anxiety.
Individuals with greater risk factors and co-morbid physical illness may have more difficulty achieving higher levels of physical activity.
The difficulty of capturing all dimensions of physical activity by questionnaire is well-known[ 38, 39], particularly non-leisure activities in women[ 40].
The first important finding of the study confirms that the concept "physical activity" in patients with COPD has two domains, which we labelled "amount of physical activity" and "difficulty with physical activity".
The reduction in number of PEB and POB over time was partly explained by reduced difficulty in walking and increased level of physical activity in the months following the fracture.
Crude (Model 1) and adjusted models were run, including (2) demographic (age, gender) and hip-fracture-related variables (time since fracture, number of chronic diseases), (3) level of physical activity, (4) difficulty in indoor (PEB models) or outdoor (POB models) walking, (5) visual acuity, (6) average outdoor temperature, or (7) housing-related features.
Consequently, the process of item reduction was performed separately according to factors 1 "amount of physical activity" and 2 "difficulty with physical activity".
In general, the assessment of physical activity is hampered by difficulties to accurately determine and recall the type and intensity of all possible activities.
The intense working tempo was considered to result in difficulties in finding time for motivational interviews and prescriptions of physical activity.
