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Table 1 Baseline characteristics

From: Change in physical activity level and clinical outcomes in older adults with knee pain: a secondary analysis from a randomised controlled trial

Characteristic Total (n = 514)
Age, n (%), years  
 45–49 52 (10)
 50–59 153 (30)
 60–69 183 (36)
 70–79 99 (19)
 ≥80 27 (5)
Female, n (%) 262 (51)
BMI, n (%), *  
 Underweight/ normal 97 (20)
 Overweight 208 (42)
 Obese 192 (39)
Currently employed n (%) * 214 (42)
Socioeconomic category, n (%) *  
 Professional 166 (43)
 Intermediate 94 (25)
 Routine and manual work 124 (32)
Comorbidities, n (%)  
 None 164 (32)
 1 comorbidity 180 (35)
 2 or more comorbidities 170 (33)
PHQ 8, 0–24, mean (SD) * 4.0 (+/− 4.7)
WOMAC, mean (SD)  
 Pain, 0–20, * 8.4 (+/− 3.5)
 Function, 0–68, * 28.1 (+/− 12.3)
 Stiffness, 0–8, * 3.7 (+/− 1.7)
Knee pain duration, n (%), years *  
 ≤ 1 125 (25)
 More than1 but < 5 198 (39)
 More than 5 but < 10 94 (19)
 10+ 91 (18)
Widespread pain n (%) * 79 (15)
  1. Footnote: Baseline descriptive statistics based on complete cases; * = subject to missing data (hence individual item frequencies may not add to total sample). Missing data was 2% in primary clinical variables, less than 10% in all remaining variables except socioeconomic category which was 25% missing. Body Mass Index: less than 25 = underweight/ normal, 25 or more but less than 30 = overweight, 30 or more = obese. Comorbidities included (in descending order of frequency) Hypertension, Asthma, Diabetes, Angina, Heart attack and Heart failure
  2. Abbreviations: BMI Body Mass Index, PHQ 8  Personal Health Depression Questionnaire (higher scores indicate lower mood), SD  Standard deviation; Widespread pain = Manchester Widespread Pain [27]; WOMAC Western Ontario and McMaster Universities Osteoarthritis Index
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