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adult disability activity study population fitness level participant health instrument research chapter people thessa 13-03-12 bw.indd mobility search literature group result speed scale assessment measure balance reliability strength number hilgenkamp component gender client endurance feasibility ha-id table sport barthel index evenhui syndrome support ageing pedometer journal fi tness index lawton iadl scale measurement sample model patient chair score fitness tests barthel block test berg balance scale wijck muscle caregiver organization res dev disabil fitness levels shuttle exercise activity levels consent subgroups een verstandelijke beperking validity questionnaire reference regression value category block care providers range / research