Table 1.
Sample Characteristics
| Overall (n=174)* | 65-69 (n=48) | 70-79 (n=77) | 80+ (n=49) | p value† | |
|---|---|---|---|---|---|
| Age, median, range | 74 (65-96) | 67 | 74 | 83 | |
| Sex, N (%): Female | 133 (76.4) | 36 (73.5) | 58 (75.3) | 39 (81.3) | 0.37 |
| Race/Ethnicity, N (%): | |||||
| Non-Hispanic White | 143 (82.2) | 33 (68.8) | 67 (87.0) | 43 (87.8) | 0.02 |
| Non-Hispanic Black | 23 (13.2) | 10 (20.8) | 4 (8.2) | 9 (11.7) | |
| Other | 8 (4.6) | 5 (10.4) | 1 (1.3) | 2 (4.1) | |
| Education, N (%) | |||||
| High School or less | 74 (45.1) | 21 (48.8) | 29 (39.7) | 24 (50.0) | 0.88 |
| Some college or beyond | 90 (54.9) | 22 (51.2) | 44 (60.3) | 24 (50.0) | |
| Income, N (%):$25,000 or less | 71 (40.8) | 29 (46.3) | 29 (43.9) | 23 (56.1) | 0.38 |
| Over $25,000 | 34 (19.5) | 22 (53.7) | 37 (56.1) | 18 (43.9) | |
| Marital Status, N (%) | |||||
| Married | 64 (39.0) | 25 (58.1) | 28 (38.4) | 11 (22.9) | <0.01 |
| Not Married | 100 (61.0) | 18 (41.9) | 45 (61.6) | 37 (77.1) | |
| Lives Alone, N (%) | 76 (46.3) | 17 (39.5) | 31 (42.5) | 28 (58.3) | 0.07 |
| Clinical Data: | |||||
| WOMAC (total), mean (SD) ‡ | 56.3 (13.2) | 58.8 (13.5) | 56.3 (13.7) | 55.5 (12.6) | 0.63 |
| SF-12, Mean (SD) ‡ | |||||
| Physical | 33.2 (9.2) | 32.9 (8.5) | 34.9 (10.0) | 31.0 (8.0) | 0.28 |
| Mental | 41.2 (6.6) | 40.0 (6.5) | 41.1 (6.2) | 43.0 (7.0) | 0.03 |
| Instrumental activities of daily living‡ (physical subset), mean (SD) | 2.4 (1.8) | 2.0 (1.6) | 2.2 (1.7) | 3.1 (1.8) | <0.01 |
| Basic activities of daily living‡ Mean dependencies (SD) | 0.2 (0.7) | 0.1 (0.5) | 0.2 (0.6) | 0.3 (0.9) | 0.10 |
| Modified Mini Mental State Exam‡ (Out of 22) mean, (SD) | 18.9 (2.5) | 19.4 (2.5) | 19.2 (2.4) | 17.9 (2.5) | <0.01 |
| Krantz Information-Seeking Survey‡ mean (SD) | 3.3 (2.2) | 3.6 (2.1) | 3.6 (2.2) | 2.5 (2.0) | 0.02 |
| Decisional Conflict Scale, mean (SD) ‡ | 41.1 (13.0) | 43.8 (15.4) | 41.1 (12.3) | 38.7 (11.4) | 0.06 |
| Perceptions of Surgery, N (%) | |||||
| Joint replacement surgery would be: | |||||
| 1. extremely/very helpful in relieving pain | 88 (60.7) | 25 (62.5) | 39 (61.9) | 24 (57.1) | 0.62 |
| 2. extremely/very risky | 62 (40.8) | 16 (40.0) | 24 (33.3) | 22 (52.2) | 0.22 |
| Extremely/very worried about: | |||||
| 1) dying during or after surgery | 52 (32.5) | 12 (27.9) | 16 (22.1) | 24 (53.3) | 0.01 |
| 2) complication from surgery | 46 (31.9) | 12 (30.8) | 16 (25.0) | 18 (43.9) | 0.20 |
| 3) a long recovery from surgery | 95 (58.6) | 22 (51.2) | 37 (51.4) | 36 (76.6) | 0.01 |
| 4) needing help from others during recovery period | 78 (48.2) | 17 (39.5) | 33 (45.8) | 28 (59.6) | 0.06 |
Ten patients did not complete baseline interviews and their responses were missing for all variables above except age, sex, race, and ethnicity.
The p values represent results from the Mantel-Haenszel Test of Trend when proportions are presented and from an Analysis of Variance when means are presented.
WOMAC:Western Ontario and McMaster Universities osteoarthritis index; scores range: 0-100 (higher scores indicates more severe symptoms),
SF-12: 12-Item Short-Form Health Survey; scores range: 0-100 on both the mental and physical summary scales (higher scores indicate less severe symptoms)
Instrumental activities of daily living (physical subset) [food preparation, household chores, going shopping, doing laundry, outside activities, driving or using public transportation; one point was assigned for each activity with which the patient required assistance]. Scores range: 0-6 (higher scores indicates more disability)
Basic activities of daily living [getting or of bed or chair, change night clothes, washing, eating, toilet or bathroom use, and walking; one point was assigned for each ADL with which the patient required assistance]. Scores range: 0-6 (higher score indicates more disability)
Modified Mini Mental Status; scores range: 0-22 (higher scores indicate better cognitive function).
Krantz Health Opinion Survey, Information seeking subset; scores range: 0-7 (higher scores represent individual who have greater desire to be informed about issues regarding their health)
Decisional Conflict Scale; scores range 0 [no decisional conflict] to 100 [extremely high decisional conflict].