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Erschienen in: BMC Women's Health 1/2013

Open Access 01.12.2013 | Research article

Factors influencing diagnosis and treatment of osteoporosis after a fragility fracture among postmenopausal women in Asian countries: a retrospective study

verfasst von: Annie W Kung, Tao Fan, Ling Xu, Wei B Xia, Il Hyung Park, Hak Sun Kim, Siew Pheng Chan, Joon Kiong Lee, Leonard Koh, Yung Kuei Soong, Suppasin Soontrapa, Thawee Songpatanasilp, Thana Turajane, Marc Yates, Shuvayu Sen

Erschienen in: BMC Women's Health | Ausgabe 1/2013

Abstract

Background

A vast amount of literature describes the incidence of fracture as a risk for recurrent osteoporotic fractures in western and Asian countries. Osteoporosis evaluation and treatment after a low-trauma fracture, however, has not been well characterized in postmenopausal women in Asia. The purpose of this study was to characterize patient and health system characteristics associated with the diagnosis and management of osteoporosis among postmenopausal women hospitalized with a fragility fracture in Asia.

Methods

Patient surveys and medical charts of postmenopausal women (N=1,122) discharged after a fragility hip fracture from treatment centers in mainland China, Hong Kong, Singapore, South Korea, Malaysia, Taiwan, and Thailand between July 1, 2006 and June 30, 2007 were reviewed for bone mineral density (BMD) measurement, osteoporosis diagnosis, and osteoporosis treatment.

Results

The mean (SD) age was 72.9 (11.5) years. A BMD measurement was reported by 28.2% of patients, 51.5% were informed that they had osteoporosis, and 33.0% received prescription medications for osteoporosis in the 6 months after discharge. Using multivariate logistic regression analyses, prior history of fracture decreased the odds of a BMD measurement (OR 0.63, 95% CI 0.45-0.88). Having a BMD measurement increased the odds of osteoporosis diagnosis (OR 10.1, 95% CI 6.36-16.0), as did having health insurance (OR 4.95, 95% CI 1.51-16.21 for private insurance with partial self-payment relative to 100% self-payment). A history of fracture was not independently associated with an osteoporosis diagnosis (OR 0.80, 95% CI 0.56-1.15). Younger age reduced the odds of receiving medication for osteoporosis (OR 0.59, 95% CI 0.36-0.96 relative to age ≥65), while having a BMD measurement increased the odds (OR 1.79, 95% CI 1.23-2.61).

Conclusions

Osteoporosis diagnosis and treatment in Asian countries were driven by BMD measurement but not by fracture history. Future efforts should emphasize education of general practitioners and patients about the importance of fracture.
Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1472-6874-13-7) contains supplementary material, which is available to authorized users.

Competing interests

TF, AM, and, SSS are employees of Merck & Co., Inc. The other authors have no conflicts of interest to declare.

Authors’ contributions

AK, TF, and LX contributed to study design, manuscript writing, patient recruitment, questionnaire development, and statistical analysis. WX, IP, HK, SC, JL, LK, YS, SS, TS, and TT contributed to study design, manuscript writing, patient recruitment, and questionnaire development. MY contributed to study design, manuscript writing, and questionnaire development. AM contributed to manuscript writing and SSS contributed to study design and questionnaire development. All of the authors reviewed and approved the final manuscript.
Abkürzungen
AK
A.W. Kung
AM
A. Modi
BMD
Bone mineral density
GPs
General practitioners
HK
H.S. Kim
ICD
International Statistical Classification of Diseases and Related Health Problems
IP
I.H. Park
IRB
Institutional review board
JL
J.K. Lee
LK
L. Koh
LX
L. Xu
MY
M. Yates
SC
S.P. Chan
SS
S. Soontrapa
SSS
S. Sen
TF
T. Fan
TS
T. Songpatanasilp
TT
T. Turajane
UK
United Kingdom
WX
W.B. Xia
YS
Y.K. Soong.

Background

The prevalence of osteoporosis increases markedly after age 50 in postmenopausal women in Asia [13]. In Korea the prevalence of osteoporosis measured by bone mineral density (BMD) scanning of the lumbar spine has been reported to be 31% in postmenopausal women 45–64 years, 53% in those 65–74 years, and 69% in those ≥75 years [3]. Similar observations have been made in Taiwan [1].
A definitive diagnosis of osteoporosis in asymptomatic women is achieved via BMD measurement but, because of the relatively high cost of these measurements, a case-finding strategy is recommended [4]. A simple risk index based only on age and body weight can be used to screen for osteoporosis in Asian postmenopausal women prior to BMD measurement [58]. Since prior fracture is a well-documented risk factor for a future non-vertebral osteoporotic fracture in postmenopausal women in western and Asian countries [911], therefore, it is recommended that after a fragility fracture all postmenopausal women should be evaluated for osteoporosis [12]. Recent studies in western countries indicate that rates of treatment with medications for osteoporosis after a fracture vary widely. In a study in Italy 78% of patients received a medication for osteoporosis after a hip fracture [13]. Conversely, in the Netherlands only 19% of women age ≥50 years were treated with medications for osteoporosis in the year after a low-trauma fracture [14] and in Belgium only 6% of postmenopausal women received a bisphosphonate or hormone therapy after a hip fracture [15].
Little is known, however, about osteoporosis evaluation and treatment after a low-trauma fracture in countries in Asia. The objective of this study was to evaluate the diagnosis and treatment of osteoporosis among postmenopausal women after hospitalization for a fragility fracture in a selection of Asian countries.

Methods

Study design and patient sample

This was a patient survey and medical chart review carried out at multiple centers in six Asian countries including mainland China, Hong Kong, Singapore, South Korea, Malaysia, Taiwan, and Thailand. Women who were hospitalized due to fragility fracture of the hip between July 1st, 2006 and June 30th, 2007 (the case identification period) were identified using discharge records of participating hospitals. A random sample of these patients was selected for inclusion in the study. Patients were included if they had been hospitalized because of non-traumatic hip fracture (defined as resulting from a fall from standing height), were postmenopausal, and were able to participate independently in an interview. The index fracture, i.e., the fracture qualifying the subject for enrollment, was identified by reviewing hospitalization, emergency room or outpatient visit records for ICD-9/10 diagnosis codes 820.0, 820.2, or 820.8. Approval was obtained from participating hospital IRB committees; informed consent was provided by all patients.

Data collection

Medical chart review

Medical charts were reviewed during hospitalization to obtain data on BMD (T-score for spine, femoral neck, or total hip), height and weight, comorbidities, and medications prescribed for osteoporosis.

Patient questionnaire

Face-to-face and telephone interviews were conducted with patients to collect data about an osteoporosis diagnosis, BMD measurement, and osteoporosis treatment in the 6-month period following hospitalization for fragility fracture. Patients were asked “Have you ever been told that you have osteoporosis?” If they answered “yes”, they were asked when they were told they had osteoporosis (in relation to the index fracture). They were also asked whether and when they had a BMD measurement for osteoporosis and what reimbursement, if any, they received for their hospital stay. Response options were either items in a checklist or “yes”, “no”, or “don’t know”. Questions about their post-fracture follow-up included whether they were advised to take prescription drugs or dietary supplements in the 6 month period after hospitalization for the index fracture, whether they were still being treated by a physician for osteoporosis, and the specialty of the physician. Other items recorded their demographic and, clinical characteristics and their fracture history prior to the index fracture.

Statistical analysis

The main outcome variables were binary variables (yes/no) for a BMD measurement, an osteoporosis diagnosis, and receipt of an osteoporosis medication. The associations between patient characteristics (age category, fracture history, and payment type) and the outcome variables were examined in univariate analyses; P values were computed using Fisher’s exact test. Logistic regression analyses were applied to identify significant factors independently associated with the outcome variables BMD measurement, osteoporosis diagnosis and receipt of medications. For the model with BMD screening as outcome variable, independent variables were age category, history of fracture, and payment type. Only patients who answered “yes” or “no” were included in the model with a BMD measurement as dependent variable; patients who responded “don’t know” were excluded. For the model with osteoporosis diagnosis as outcome variable, independent variables included were age category, fracture history, BMD measurement and type of payment. For the model with receipt of osteoporosis medications as outcome variable, independent variables included were age category, fracture history, fracture diagnosis timing, BMD measurement and type of payment.
A subgroup analysis assessed the impact of lower BMD on osteoporosis diagnosis and receipt of osteoporosis medications among patients whose BMD values were recorded. BMD values were expressed as a categorical variable, and Fisher’s exact test was applied. BMD of the total spine, femoral neck, or total hip was used in the stated order as available. A logistic regression model was applied to this patient subset, with osteoporosis treatment as dependent variable and the following independent variables: age category, a history of fracture, and T score category. Percent of patients using osteoporosis medications were calculated.

Results and discussion

Patient sample

Selection of sample

A total of 1,148 post-menopausal women hospitalized due to fragility fractures met the inclusion criteria and were enrolled in the study. Of these, 26 (2.3%) patients did not answer the question about an osteoporosis diagnosis and were excluded from the analysis. The data analysis was applied to the remaining 1,122 subjects.

Patient characteristics

Patient characteristics are presented in Table 1. The mean (SD) age was 72.9 (11.5) years. A history of fragility fracture prior to the hip fracture was recorded in 16.1% of patients, 52.9% had hypertension and 29.3% had diabetes. The most frequent types of payment were “partial self pay with social insurance” (40.8%) and “100% self pay” (23.2%).
Table 1
Patient characteristics
 
n
Na
(%)b
Age category (years)
   
 <50
41
1,122
(3.7)
 50-64
188
1,122
(16.8)
 ≥65
893
1,122
(79.5)
BMD measurement
316
837
(28.2)
Been told had osteoporosis
579
1,122
(51.5)
Prescription drug for osteoporosis
370
1,122
(33.0)
Histories
   
 History of fragility fracture
174
1,081
(16.1)
 Falls in past 12 months
278
1,051
(24.8)
 Family history of osteoporosis
70
777
(6.2)
 Family history of fracture
113
872
(10.1)
Corticosteroid use
41
972
(3.7)
Comorbidities
   
 Arthritis
103
889
(9.2)
 Hypertension
593
1,048
(52.9)
 Diabetes
329
975
(29.3)
 Stroke
125
920
(11.1)
 Depression
36
894
(3.2)
 Parkinson’s disease
32
892
(2.9)
Type of payment
   
 100% self pay
260
1,069
(23.2)
 Partial self pay with social insurance
458
1,069
(40.8)
 Partial self pay with private insurance
25
1,069
(2.2)
 100% paid by social insurance
100
1,069
(8.9)
 100% paid by private insurance
23
1,069
(2.0)
 Hospital treatment free of charge
41
1,069
(3.7)
 Others
162
1,069
(14.4)
aNumber of “yes” or “no” responses. Patients who did not respond to questions were treated as missing values and not included.
bAs a percent of 1,122.

BMD measurement

A BMD measurement prior to hip fracture was reported by 28.2% of the 837 patients who answered “yes” or “no” to the BMD measurement question (Table 1). Age category, a history of fracture, and type of payment were associated with having had a BMD measurement in the univariate analysis (Table 2). In the multivariate regression model (Table 3), the variables independently associated with having had a BMD measurement were fracture history (a history of fracture reduced the odds of a BMD measurement) and type of insurance (compared to 100% self pay, all specified types of insurance increased the odds of having a BMD measurement), but not age category.
Table 2
Rates of BMD measurement, osteoporosis diagnosis, and osteoporosis medication
 
BMD measurement (N=1,122)
Osteoporosis diagnosis (N=1,122)
Osteoporosis medication (N=1,122)
%
P valuea
%
P valuea
%
P valuea
Total
28.2
 
51.5
 
33.0
 
Age
 
<0.001
 
0.009
  
 <50
9.8
 
17.1
 
0.0
 
 50-64
30.3
 
51.6
 
22.3
 
 ≥65
28.7
 
53.1
 
35.5
 
Fracture history
 
<0.001
 
<0.001
 
0.53
 Yes (n=174)
38.5
 
65.5
 
36.8
 
 No (n=907)
26.9
 
48.6
 
32.0
 
Payment type
 
<0.001
 
<0.001
 
<0.001
 100% self pay
19.7
 
10.9
 
23.2
 
 Partial self pay with social insurance
25.9
 
21.2
 
40.8
 
 Partial self pay with private insurance
1.4
 
1.4
 
2.2
 
 100% paid by social insurance
7.3
 
3.3
 
8.9
 
 100% paid by private insurance
1.3
 
1.0
 
2.0
 
 Hospital treatment free of charge
3.4
 
2.5
 
3.7
 
 Others
11.2
 
9.6
 
14.4
 
 Unknown insurance
29.7
 
1.6
 
4.7
 
aP-value for Fisher’s exact test.
Table 3
Logistic regression analyses
 
BMD measurement (N=837)
Osteoporosis diagnosis
Osteoporosis medication
OR
(95% CI)
OR
(95% CI)
OR
(95% CI)
Age
      
 20- 49
1.38
(0.35 -5.51)
0.6
(0.18-2.00)
N/A
 
 50-64
1.36
(0.91-2.05)
1.19
(0.77-1.84)
0.59
(0.36-0.96)
 65+
Reference
 
Reference
 
Reference
 
Fracture history
      
 Yes
0.63
(0.45-0.88)
0.80
(0.56-1.15)
1.05
(0.71-1.54)
 No
Reference
 
Reference
 
Reference
 
Fracture diagnosis timing
      
 Before index fracture
N/A
 
N/A
 
0.99
(0.64-1.52)
 During index fracture
N/A
 
N/A
 
1.38
(0.87-2.18)
 After index fracture
N/A
 
N/A
 
Reference
 
 Unknown
N/A
 
N/A
 
0.28
(0.05-1.47)
A BMD measurement
      
 Yes
N/A
 
10.1
(6.36-16.0)
1.79
(1.23-2.61)
 Unknown
N/A
 
0.06
(0.03-0.10
1.48
(0.59-3.74)
 No
N/A
 
Reference
 
Reference
 
Type of payment
      
 100% private insurance
8.19
(2.63 -25.58)
0.72
(0.20-2.54)
2.03
(0.54-7.66)
 100% social insurance
1.96
(1.09 -3.50)
0.47
(0.27-0.84)
0.18
(0.07-0.51)
 Other type of insurance
5.08
(3.11 -8.30)
2.48
(1.45-4.25)
2.45
(1.40-4.29)
 Unknown insurance
1.33
(0.62-2.83)
0.39
(0.19-0.80)
1.05
(0.38-2.92)
 Free hospital, government pay
4.13
(2.00-8.54)
1.31
(0.57-3.03)
1.56
(0.66-3.70)
 Partial self with private insurance
3.43
(1.19-9.86)
4.95
(1.51-16.21)
0.49
(0.15-1.59)
 Partial self with social insurance
3.94
(2.61 -5.95)
1.89
(1.28-2.81)
0.72
(0.45-1.15)
 100% self pay
Reference
 
Reference
 
Reference
 
N/A, not applicable.

Osteoporosis diagnosis

Over half of the patients (51.5%) reported that they had been told they had osteoporosis (Table 1). Older age category, a history of fracture, and type of payment were significantly associated with an osteoporosis diagnosis (Table 2). In logistic regression analysis having had a BMD measurement and type of payment were associated with an osteoporosis diagnosis: compared to individuals with 100% self pay, the odds of an osteoporosis diagnosis were decreased among patients with 100% social insurance and increased among patients with partial self payment with private or social insurance, and among those with “other type of insurance” (Table 3). However, a fracture history was not significantly associated with an osteoporosis diagnosis. T scores were available for 256 patients. A lower T score was more likely associated with an osteoporosis diagnosis in the univariate analysis (Table 4).
Table 4
Osteoporosis diagnosis and treatment among the subgroup of patients with a BMD measurement
T score
n (%)
Osteoporosis diagnosis (%)a
Osteoporosis medication (%)a
Greater than −1
23 (9.0)
60.9
43.8
−1 to −2.5
103 (40.2)
70.0
59.2
−2.5 to −3
39 (15.2)
92.3
61.5
Lower than −3
91 (35.6)
82.4
78.0
Total
256 (100)
77.0
64.8
aP=0.003 (Fisher’s exact test).

Osteoporosis treatment

Only 33.0% of patients received prescription medications for osteoporosis in the 6 months after the index fracture (Table 1). A bisphosphonate was prescribed for 26% of patients, representing 79% of prescription medications for osteoporosis (Table 5). Calcitonin was the most frequent non-bisphosphonate therapy, used by 4.8% of patients. Half of the patients (50.3%) used dietary supplements (Table 5).
Table 5
Osteoporosis treatments
 
(%) (N=1,122)
Prescription medications for osteoporosisa
 
 Any prescription drugs
(33.0)
 Any bisphosphonate
(26.0)
 Any anti-resorptive
(31.0)
 Alendronate
(16.5)
 Risedronate
(6.9)
 Calcitonin
(4.8)
 Pamidronate
(4.2)
 Raloxifene
(2.2)
 Others
(2.9)
Supplement use
 
 Any supplement
(50.3)
 Calcium
(32.1)
 Vitamin D
(23.8)
 Multi-vitamin
(9.1)
aMedications used by >2.0% of patients are listed.
Patient age category and payment type were significantly associated with treatment for osteoporosis in univariate analyses (Table 2). Age category, having had a BMD measurement, fracture history and type of payment were associated with osteoporosis treatment in multivariate logistic analysis (Table 3). Younger age category (50–64 years) reduced the odds of receiving medication for osteoporosis, while having had a BMD measurement increased the odds of treatment. The odds of treatment were reduced by having 100% social insurance and increased by “other type of insurance” when compared to 100% self pay. A history of fracture was not associated with receiving medications for osteoporosis. A more negative T score was associated with osteoporosis treatment in the univariate analysis (Table 4).

Rates of BMD measurement, osteoporosis diagnosis and treatment, by country

Korea and Thailand were the top ranking countries for rates of BMD measurement, osteoporosis diagnosis, and osteoporosis treatment (Figure 1). Malaysia was the only country in which the rate of osteoporosis treatment exceeded the rate of diagnosis. Rates of diagnosis and treatment exceeded rates of BMD testing in all countries except mainland China and Singapore.
In this population of elderly (average age 72.9 years) women discharged from hospital after a fragility fracture, having a BMD measurement (28.2% of patients) increased the odds of a diagnosis of osteoporosis and treatment. Compared to 100% self-payment, having any known type of health insurance increased the odds of a BMD measurement-suggesting an unwillingness to pay out of pocket for preventive care-while having 100% social insurance reduced both the odds of receiving prescription medicines for osteoporosis and the odds of an osteoporosis diagnosis-almost half (48.5%) of the patients had not been told that they had osteoporosis.
Among the 41% of patients who reported their physician’s specialty, the same percentage (29%) of orthopedic specialists and general practitioners (GPs) prescribed medications for osteoporosis. However, information about osteoporosis was communicated to patients largely by orthopedic specialists (76%) rather than by GPs (11%), suggesting that GPs need more education about osteoporosis.
Results of this study suggest that greater attention should be paid to patients with a history of fracture. A history of fracture, recorded for 13.2% of patients, was not significantly associated with an osteoporosis diagnosis independently of other factors-BMD, age, payment type-or with receiving medications for osteoporosis medications after the index fracture. The only statistically significant sequelae of a history of prior fracture was that it reduced the odds of a BMD measurement-perhaps because physicians deduced that a prior fracture was indicative of osteoporosis, obviating the need for a BMD test. A recurrent fracture after the index fracture was experienced by 9% of the patients in this study. A history of prior fracture was a significant independent predictor of a recurrent facture (OR 1.67, 95% CI 1.02-2.72), while other factors (age, an osteoporosis diagnosis, a BMD measurement) were not significantly predictive.

Summary

In this study, an average of 33.0% of patients received a prescription medication for osteoporosis in the 6 months after the index fracture, though this varied from 6.5% in mainland China to 63.5% in Thailand. These rates are comparable or better than recent practice recorded in Western countries. In a 2003–04 UK study of patients (97% women) after a fracture of the distal radius, 8.5% were referred for BMD scanning, calcium and vitamin D was prescribed to 22%, and bisphosphonates to 9% [16]. In a 2006 study set in Sweden, management of patients post fracture depended on the results of a BMD scan [17]. In the three years after the fracture, antiresorptive medicines (excluding calcium-vitamin D) had been received by two thirds of osteoporotic, one sixth of osteopenic, and none of the patients with normal BMD [17]. There is little recent data for the United States, and most studies of medical practice after low-trauma or hip fracture relate to small single-center studies in the 1990s. Among these US studies the median rate of prescribed medicines for osteoporosis after a fracture was 24% (range 5-60%) [1824].

Conclusions

Even after experiencing a fragility fracture, 48.5% of Asian postmenopausal women reported that they had not been told that they had osteoporosis and only 33.0% were receiving prescription medications for osteoporosis. A history of fracture did not increase the odds of an osteoporosis diagnosis or treatment, indicating that both patients and GPs should be educated about the importance of fractures in the evaluation of osteoporosis.

Acknowledgments

Funding for this study was provided by Merck & Co., Inc. The authors thank Julia Vishnevetsky, MPH, Dimitra Panagiotoglou, Lauren Weisenfluh, and Melissa Stauffer, PhD, in collaboration with SCRIBCO, for medical writing assistance.
Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( https://​creativecommons.​org/​licenses/​by/​2.​0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Competing interests

TF, AM, and, SSS are employees of Merck & Co., Inc. The other authors have no conflicts of interest to declare.

Authors’ contributions

AK, TF, and LX contributed to study design, manuscript writing, patient recruitment, questionnaire development, and statistical analysis. WX, IP, HK, SC, JL, LK, YS, SS, TS, and TT contributed to study design, manuscript writing, patient recruitment, and questionnaire development. MY contributed to study design, manuscript writing, and questionnaire development. AM contributed to manuscript writing and SSS contributed to study design and questionnaire development. All of the authors reviewed and approved the final manuscript.
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Metadaten
Titel
Factors influencing diagnosis and treatment of osteoporosis after a fragility fracture among postmenopausal women in Asian countries: a retrospective study
verfasst von
Annie W Kung
Tao Fan
Ling Xu
Wei B Xia
Il Hyung Park
Hak Sun Kim
Siew Pheng Chan
Joon Kiong Lee
Leonard Koh
Yung Kuei Soong
Suppasin Soontrapa
Thawee Songpatanasilp
Thana Turajane
Marc Yates
Shuvayu Sen
Publikationsdatum
01.12.2013
Verlag
BioMed Central
Erschienen in
BMC Women's Health / Ausgabe 1/2013
Elektronische ISSN: 1472-6874
DOI
https://doi.org/10.1186/1472-6874-13-7

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