Figures
Study flowchart.
Health-related quality of life by severity of hip and knee joint disease. Lower Assessment of Quality of Life (AQoL) instrument score indicates lower health-related quality of life (range=−0.04 to 1.00). Classification of severity: asymptomatic=Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score <7, mild-moderate=WOMAC score 7–38, severe=WOMAC score ≥39. Asterisk indicates analysis of covariance with adjustment for age and sex. CI=confidence interval, OA=osteoarthritis. AQoL scores were missing for 2 participants from the mild-moderate group.
Tables

Demographic Characteristics of Study Participantsa
↵a IQR=interquartile ratio, BMI=body mass index, SEIFA=Australian Socio-Economic Indexes for Areas, OA=osteoarthritis.
b Complete diagnosis data were not reported by 3 participants; total numbers for each characteristic may not equal n=917 or n=237 because of missing or unclear responses.
c Mann-Whitney U test; χ2 tests were used for all other analyses.

Paid and Unpaid Work Status According to Severity
a Chi-square test.
b OA=osteoarthritis.

Health Service Utilization in the Previous Month According to Severity
a Chi-square test.
b Health service included in total cost of primary care and specialist medical care analyses.
c Analyses not performed for “other” types of health services because of infrequent utilization

Previous Hip and Knee Surgery and Estimated Costs According to Severitya
↵a N/A=not applicable, IQR=interquartile range.
b Australian Refined Diagnosis-Related Groups version 5.2 (except for tibial osteotomy and revision knee replacement, which were coded with the use of version 6.0).
c Total average cost per AR-DRG extracted from the National Hospital Cost Data Collection Cost Report Round 13 (2008–2009). All costs are reported in Australian dollars (A$1.00=US$1.04).
d Comparison of costs across groups, P=.71.