Table 2 Distribution of responses to the Hip and Knee Osteoarthritis Decision Quality Instruments for patients and providers across the two studies.
From: Decision quality instrument for treatment of hip and knee osteoarthritis: a psychometric evaluation
| Â | Study 1 | Â | Study 2 | Â |
|---|---|---|---|---|
| Â | Patients | Providers | Control | Decision Aid |
Item | N(%) | N(%) | N(%) | N(%) |
†1. Over time, without surgery, what usually happens to the pain from hip/knee osteoarthritis? | ||||
   Gets better | 2 (0.5) | 4 (4.4) | 1 (1.5) | 2 (3.3) |
   Stays about the same | 15 (3.9) | 5 (5.6) | 3 (4.5) | 6 (9.8) |
   * Gets worse | 344 (90) | 78 (86.7) | 59 (89.4) | 52 (85.2) |
   Not sure | 17 (4.5) | 2 (2.2) | 3 (4.5) | 1 (1.6) |
   Missing | 2 (0.5) | 1 (1.1) | 0 (0) | 0 (0) |
2. For each of the following, please mark whether or not it can help relieve the pain of hip/knee osteoarthritis. | ||||
   a. Exercise | ||||
*Yes | 217 (56.8) | 65 (72.2) | 51 (77.3) | 57 (93.4) |
No | 105 (27.5) | 18 (20) | 7 (10.6) | 4 (6.6) |
Not sure | 53 (13.9) | 5 (5.6) | 8 (12.1) | 0 (0) |
Missing | 6 (1.6) | 2 (2.2) | 0 (0) | 0 (0) |
   b. Physical therapy | ||||
*Yes | 229 (59.9) | 71 (78.8) | 50 (75.8) | 54 (88.5) |
No | 87 (22.8) | 13 (14.4) | 6 (9.1) | 5 (8.2) |
Not sure | 61 (16.0) | 5 (5.6) | 10 (15.2) | 2 (3.3) |
Missing | 5 (1.3) | 1 (1.1) | 0 (0) | 0 (0) |
   c. Staying off the leg | ||||
*Yes | 162 (42.4) | 58 (64.4) | 36 (54.5) | 39 (63.9) |
No | 150 (39.3) | 23 (25.6) | 22 (33.3) | 19 (31.1) |
Not sure | 61 (16) | 8 (8.9) | 7 (10.6) | 3 (4.9) |
Missing | 9 (2.3) | 1 (1.1) | 1 (1.5) | 0 (0) |
   d. Over-the-counter pain medicine | ||||
*Yes | 257 (67.3) | 87 (96.7) | 50 (75.8) | 50 (82.0) |
No | 70 (18.6) | 0 (0) | 10 (15.2) | 6 (9.8) |
Not sure | 48 (12.6) | 2 (2.2) | 5 (7.6) | 5 (8.2) |
Missing | 6 (1.6) | 1 (1.1) | 1 (1.5) | 0 (0) |
†3. After hip/knee replacement surgery, about how many months does it take most people to get back to doing their usual activities? | ||||
   Less than 1 month | 2 (0.5) | 1 (1.1) | 1 (1.5) | 0 (0) |
   1 to 2 months | 75 (19.6) | 22 (24.4) | 14 (21.2) | 7 (11.5) |
   *3 to 9 months | 236 (61.8) | 57 (63.3) | 27 (40.9) | 44 (72.1) |
   More than 9 months | 34 (8.9) | 9 (10.0) | 6 (9.1) | 7 (11.5) |
   Not sure | 31 (8.1) | 0 (0) | 18 (27.3) | 3 (4.9) |
   Missing | 3 (0.8) | 1 (1.1) | 0 (0) | 0 (0) |
†4. About how many people who have hip/knee replacement surgery will need to have the same hip/knee replaced again in less than 15 years? | ||||
   More than half | 28 (7.3) | 1 (1.1) | 8 (12.1) | 5 (8.2) |
   About half | 49 (12.8) | 5 (5.6) | 7 (10.6) | 7 (11.5) |
   *Less than half | 79 (20.7) | 39 (43.3) | 15 (22.7) | 15 (24.6) |
   *Almost none | 103 (27) | 43 (47.8) | 12 (18.2) | 26 (42.6) |
   Not sure | 115 (30) | 0 (0) | 24 (36.4) | 8 (13.1) |
   Missing | 4 (1.0) | 2 (2.2) | 0 (0) | 0 (0) |
†5. If 100 people have hip/knee replacement surgery, about how many will have less hip/knee pain when walking after the surgery? | ||||
   0-25 | 10 (2.6) | 0 (0) | 1 (1.5) | 2 (3.3) |
   26-50 | 6 (1.6) | 3 (3.3) | 2 (3.0) | 1 (1.6) |
   51-75 | 54 (14.1) | 12 (13.3) | 5 (7.6) | 3 (4.9) |
   *76-100 | 251 (65.7) | 72 (80.0) | 38 (57.6) | 47 (77.0) |
   Not sure | 57 (14.9) | 3 (0) | 20 (30.3) | 8 (13.1) |
   Missing | 3 (.8) | 3 (3.3) | 0 (0) | 0 (0) |
†6. Serious complications can happen after hip/knee replacement surgery, such as death, life-threatening blood clots, infection and heart attack. Out of 100 people who have hip/knee replacement surgery, about how many will have a serious complication within the three months after the surgery? | ||||
   *Fewer than 5 | 164 (42.9) | 62 (68.9) | 29 (43.9) | 45 (73.8) |
   5-10 | 64 (16.8) | 18 (20.0) | 7 (10.6) | 5 (8.2) |
   11-15 | 20 (5.2) | 9 (10.0) | 3 (4.5) | 1 (1.6) |
   More than 15 | 9 (2.4) | 1 (1.1) | 2 (3.0) | 1 (1.6) |
   Not sure | 115 (30.1) | 0 (0) | 25 (37.9) | 9 (14.8) |
   Missing | 10 (2.6) | 0 (0) | 0 (0) | 0 (0) |
7. For each of the following, mark whether or not it is a possible complication of hip/knee replacement surgery. | ||||
   a. Stomach ulcers | ||||
*Yes | 32 (8.4) | 59 (65.6) | 4 (6.1) | 14 (23.0) |
No | 209 (54.7) | 25 (27.8) | 40 (60.6) | 35 (57.4)) |
Not sure | 126 (33) | 5 (5.6) | 22 (33.3) | 12 (19.7) |
Missing | 15 (3.9) | 1 (1.1) | 0 (0) | 0 (0) |
   b. Blood clot in the leg | ||||
*Yes | 332 (86.9) | 45 (100.0) | 51 (77.3) | 52 (85.2) |
No | 7 (1.8) | 0 (0) | 3 (4.5) | 3 (4.9) |
Not sure | 34 (8.9) | 0 (0) | 12 (18.2) | 6 (9.8) |
Missing | 8 (2.1) | 0 (0) | 0 (0) | 0 (0) |
   c. Migraine headaches | ||||
Yes | 21 (5.5) | 9 (10.0) | 5 (7.6) | 4 (6.6) |
*No | 210 (55) | 62 (68.9) | 36 (54.5) | 40 (65.6) |
Not sure | 135 (35.3) | 18 (20.0) | 25 (37.9) | 17 (27.9) |
Missing | 16 (4.2) | 1 (1.1) | 0 (0) | 0 (0) |
   d. Infection of the artificial hip/knee | ||||
*Yes | 279 (84.8) | 45 (100.0) | 51 (77.3) | 51 (83.6) |
No | 9 (2.7) | 0 (0) | 1 (1.5) | 2 (3.3) |
Not sure | 30 (9.1) | 0 (0) | 14 (21.2) | 8 (13.1) |
Missing | 9 (2.7) | 0 (0) | 0 (0) | 0 (0) |
8. For each of the following, mark whether or not it is a possible side effect of using over-the-counter pain medicine for a long time. These include medicines you can buy without a prescription like Advil, Aleve or aspirin. | ||||
   a. Stomach ulcer | ||||
*Yes | 320 (83.8) | 45 (100.0) | 56 (84.8) | 58 (95.1) |
No | 10 (2.6) | 0 (0) | 3 (4.5) | 1 (1.6) |
Not sure | 40 (10.5) | 0 (0) | 7 (10.6) | 2 (3.3) |
Missing | 12 (3.1) | 0 (0) | 0 (0) | 0 (0) |
   b. Blood clot in the leg | ||||
Yes | 59 (15.4) | 5 (5.6) | 11 (16.7) | 18 (29.5) |
*No | 171 (44.8) | 81 (90.0) | 29 (43.9) | 32 (52.5) |
Not sure | 137 (35.9) | 2 (2.2) | 26 (39.4) | 11 (18.0) |
Missing | 13 (3.4) | 2 (2.2) | 0 (0) | 0 (0) |
   c. Migraine headaches | ||||
Yes | 42 (11) | 23 (25.5) | 8 (12.1) | 12 (19.7) |
*No | 164 (42.9) | 48 (53.3) | 28 (42.4) | 33 (54.1) |
Not sure | 160 (41.9) | 18 (20.0) | 30 (45.5) | 16 (26.2) |
Missing | 16 (4.2) | 1 (1.1) | 0 (0) | 0 (0) |
   d. Kidney problems | ||||
*Yes | 243 (73.8) | 45 (100.0) | 37 (56.1) | 45 (73.8) |
No | 14 (4.2) | 0 (0) | 6 (9.1) | 6 (9.8) |
Not sure | 63 (19.1) | 0 (0) | 23 (34.8) | 10 (16.4) |
Missing | 9 (2.7) | 0 (0) | 0 (0) | 0 (0) |
   e. Excessive bleeding | ||||
*Yes | 243 (73.8) | 85 (94.4) | 37 (56.1) | 40 (65.6) |
No | 13 (3.9) | 3 (3.3) | 8 (12.1) | 14 (23.0) |
Not sure | 63 (19.1) | 0 (0) | 21 (31.8) | 7 (11.5) |
Missing | 9 (2.7) | 1 (1.1) | 0 (0) | 0 (0) |