The development of the nutrition and activity knowledge scale for use with people with an intellectual disability

<b>Background </b>Obesity is an increasing health problem for many Australians, no less so among people with an intellectual disability. Behaviour change aimed at improving nutritional intake and increasing levels of physical activity is a requirement for the reduction of obesity. An essential part of this process is to first ascertain the level of knowledge and beliefs people with an intellectual disability have about these behaviours.<br /><br /><b>Methods</b> The aim of this study was to develop and psychometrically evaluate a scale to assess levels of nutritional and physical activity knowledge among people with an intellectual disability.<br /><br /><b>Results</b> Seventy-three people with an intellectual disability completed the interview-rated scale at time 1 and 66 of them completed it again at a 3-week re-test.<br /><br /><b>Conclusions</b> The scale demonstrated strong factorial construct validity, high internal consistency and good temporal stability. The applications of this scale in future research and in intervention programmes are discussed.<br />