Table 1. Characteristics of Patients Included in the Study (N = 131).

From: Psychometric Evaluation of the Japanese 9-Item Shared Decision-Making Questionnaire and Its Association with Decision Conflict and Patient Factors in Japanese Primary Care

Feature Category Number (%)
Age (year) 20s-60s 93 (70.8)
≥70s 37 (28.2)
No answer 1 (1.0)
Sex Female 72 (55.0)
Male 58 (44.3)
No answer 1 (0.7)
Education High school 48 (36.6)
University or above 47 (35.9)
Junior high school 19 (14.5)
College of technology 16 (12.2)
No answer 1 (0.8)
Marital status Married 79 (60.3)
Unmarried 52 (39.7)
Employment status Employed 65 (49.6)
Housewife 33 (25.2)
After retirement 19 (14.5)
Other 13 (9.9)
No answer 1 (0.7)
Table 2. Item Characteristics of the Japanese Version of SDM-Q-9 (N = 131).

From: Psychometric Evaluation of the Japanese 9-Item Shared Decision-Making Questionnaire and Its Association with Decision Conflict and Patient Factors in Japanese Primary Care

Minimum value Maximum value Mean (median) SD Cronbach’s α if item deleted I-T correlation Factor loading
SDM1.My doctor made clear that a decision needs to be made. 0 11.11 9.79 (11.11) 1.945 0.901 0.755 0.618
SDM2.My doctor wanted to know exactly how I want to be involved in making the decision. 0 11.11 10.08 (11.11) 1.771 0.908 0.649 0.449
SDM3.My doctor told me that there are different options for treating my medical condition. 0 11.11 9.52 (11.11) 2.343 0.898 0.794 0.747
SDM4. My doctor precisely explained the advantages and disadvantages of the treatment options. 0 11.11 9.19 (11.11) 2.655 0.897 0.816 0.780
SDM5. My doctor helped me understand all the information. 6.667 11.11 10.14 (11.11) 1.325 0.914 0.571 0.312
SDM6.My doctor asked me which treatment option I prefer. 0 11.11 9.94 (11.11) 1.936 0.907 0.670 0.471
SDM7.My doctor and I thoroughly weighed the different treatment options. 0 11.11 8.77 (8.89) 2.774 0.902 0.765 0.658
SDM8.My doctor and I selected a treatment option together. 0 11.11 9.75 (11.11) 1.979 0.901 0.756 0.569
SDM9.My doctor and I reached an agreement on how to proceed. 0 11.11 10.26 (11.11) 1.594 0.910 0.619 0.368
Table 3. The Distribution of the Decisional Conflict Scale (DCS) Subscores.

From: Psychometric Evaluation of the Japanese 9-Item Shared Decision-Making Questionnaire and Its Association with Decision Conflict and Patient Factors in Japanese Primary Care

DCS1 DCS2 DCS3 DCS4 DCS5 DCS6 DCS7 DCS8 DCS9 DCS10 DCS11 DCS12 DCS13 DCS14 DCS15 DCS16
Mean 0.89 0.99 1.19 1.02 1.31 1.2 1.47 0.75 0.88 0.96 1.24 1.13 0.93 0.95 1.18 0.95
Median 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
SD 0.767 0.78 0.833 0.818 0.902 0.836 1.076 0.768 0.841 0.854 0.977 0.915 0.834 0.821 0.811 0.797
Minimum value 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Maximum value 3 4 4 4 4 4 4 3 4 4 4 4 4 4 3 3
Table 4. Results of Multiple Regression Analysis Conducted Using Patient Factors and SDM Question 5.

From: Psychometric Evaluation of the Japanese 9-Item Shared Decision-Making Questionnaire and Its Association with Decision Conflict and Patient Factors in Japanese Primary Care

Variables B SE B β p values
Patient age (≥70 years) 0.642 0.298 0.217 0.033
Marital status (married) 0.503 0.231 0.186 0.032
Employment status (employed) 0.120 0.270 0.045 0.658
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