Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (6): 1085-1090. doi: 10.19723/j.issn.1671-167X.2019.06.019

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Evaluation of screening accuracy on osteoporosis self-assessment tool for Asians and its cut-off value in healthy physical examination population

Peng WANG1,Hua WU1,Ying CHE1,Dong-wei FAN2,Jue LIU3,Li-yuan TAO4,()   

  1. 1. Medical Examination Centre, Peking University Third Hospital, Beijing 100191, China
    2. Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
    3. Department of Epidemiology and Biostatistics, Peking University School of Public Health, Beijing 100191, China
    4. Research Center of Clinical Epidemiology, Peking University Third Hospital, Beijing 100191, China
  • Received:2019-05-06 Online:2019-12-18 Published:2019-12-19
  • Contact: Li-yuan TAO E-mail:tendytly@163.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(81703240)

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Abstract:

Objective: To explore the screening value of osteoporosis self-assessment tool for Asians (OSTA) and the optimal cut-off value in Chinese healthy physical examination population.Methods: We selected a healthy physical examination population for bone mineral density screening at the Health Examination Center in Peking University Third Hospital from 2013 to 2016. Quantitative ultrasound (QUS) results were used as the gold standard, and T value ≤-2.5 was defined as osteoporosis patients. Diagnostic test methods were used to analyze the sensitivity, specificity, likelihood ratio and area under curve (AUC) of different cut points of OSTA. The screening accuracy of OSTA at different cut points was compared and the optimal cut-point value determined.Results: A total of 5 833 subjects were included in the study, with an average age of (48.3±17.5) years and 2 594 women (44.5%). The QUS test showed 403 patients with osteoporosis (6.9% of the total population), 343 female osteoporosis patients (13.22% of the female population). In the whole age group, AUC at the international routine cut-off value (OSTA ≤-1) screening for osteoporosis was 0.815 (95%CI: 0.804-0.825), and screening accuracy was higher in the women (AUC=0.837, 95%CI: 0.823-0.851) than that in the men (AUC=0.767, 95%CI: 0.752-0.781; P<0.05). In the whole age group, when the optimal cut-off value was 0, its AUC 0.842 (95%CI: 0.832-0.851) was significantly higher than that when the cut-off value was -1 (P<0.01), and net reclassification improvement (NRI) increased by 5.5%. In the 40 to 65-year-old group, when OSTA cut-off value ≤0, the screening accuracy was significantly higher (NRI=19.5%, P=0.003) than that when it was-1.Conclusion: The OSTA screening tool had good osteoporosis screening value in healthy people, and the screening accuracy in women is higher than that in men. Increasing the screening cut-off value of OSTA would be helpful to improve the screening accuracy in the whole and 40 to 65-year-old population. There may be different optimal cut-off values for different age group population.

Key words: Osteoporosis self-assessment tool for Asians, Bone density, Health surveys, Sensitivity and specificity

CLC Number: 

  • R681

Table 1

Characteristics of the participants"

Items All Non-osteoporosis Osteoporosis t/χ2 P value
Participants, n (%) 5 833 5 430 (93.09) 403 (6.91)
Age/years, x?±s 48.32±17.53 46.42±16.40 74.02±10.70 33.26 <0.001
Age group, n (%) 1 111.43 <0.001
<40 years 2 398 (41.11) 2 390 (44.01) 8 (1.99)
40-65 years 2 274 (38.99) 2 216 (40.81) 58 (14.39)
≥65 years 1 161 (19.90) 824 (15.18) 337 (83.62)
Gender, n (%) 289.55 <0.001
Female 2 594 (44.47) 2 251 (41.45) 343 (85.11)
Male 3 239 (55.53) 3 179 (58.55) 60 (14.89)
Height/cm, x?±s 166.44±8.26 167.11±7.99 157.39±6.32 23.89 <0.001
Weight/kg, x?±s 67.34±13.20 67.86±13.23 60.26±10.40 11.28 <0.001
BMI/(kg/m2), x?±s 24.17±3.60 24.17±3.62 24.26±3.45 0.47 0.638

Table 2

Comparison of screening accuracy at OSTA≤-1 in different age groups"

Items Osteoporosis,n (%) Sensitivity/% Specificity/% +LR -LR AUC (95%CI)
All age group
All 403 (6.9) 73.95 88.99 6.71 0.29 0.815 (0.804-0.825)
Male 60 (1.9) 66.67 86.66 5.00 0.38 0.767 (0.752-0.781)
Female 343 (13.2) 75.22 92.27 9.73 0.27 0.837 (0.823-0.851)
More than 40-year-old
All 395 (11.5) 75.44 80.33 3.84 0.31 0.779 (0.753-0.805)
Male 58 (3.1) 68.96 77.12 3.01 0.40 0.730 (0.661-0.800)
Female 337 (22.11) 76.56 85.35 5.23 0.27 0.809 (0.781-0.838)

Figure 1

Comparison of ROC for different OSTA cut-off point in all age groups OSTA, osteoporosis self-assessment tool for Asians; ROC, receiver ope-rating characteristic curve."

Table 3

Comparison of screening accuracy for different OSTA cut-off point in different age groups"

Items AUC SE 95%CI Z P1 NRI P2
All age group
OSTA ≤-1 0.815 0.011 0.804-0.825 Ref. Ref.
OSTA ≤ 0 0.842 0.010 0.832-0.851 3.692 <0.001 0.055 <0.001
OSTA ≤ 0.62 0.850 0.009 0.841-0.859 4.048 <0.001 0.071 <0.001
40 to 65-year-old
OSTA ≤-1 0.572 0.025 0.551-0.592 Ref. Ref.
OSTA ≤ 0 0.669 0.033 0.649-0.689 3.428 <0.001 0.195 0.003
OSTA ≤ 0.62 0.724 0.033 0.706-0.743 4.693 <0.001 0.305 <0.001
More than 40-year-old
OSTA ≤-1 0.779 0.011 0.765-0.793 Ref. Ref.
OSTA ≤ 0 0.792 0.010 0.778-0.805 1.637 0.102 0.025 0.126
OSTA ≤ 0.62 0.790 0.009 0.776-0.803 1.153 0.249 0.021 0.293
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