Table 2.
Original Muscle and Joint Measure item descriptive statistics
| Content of item |
Item | Mean | Standard Deviation |
Possible Response Range |
Actual Response Range |
In Final Measure? (Yes/No) |
|---|---|---|---|---|---|---|
| Arthralgias | How much of the time (daily vs. weekly vs. monthly)? |
2.03 | 2.53 | 0-9 | 0-9 | Yes |
| Arthralgias | How much difficulty moving your joints? |
.50 | .79 | 0-3 | 0-3 | No* |
| Arthralgias | Severity usually or most of the time? |
2.14 | 2.93 | 0-10 | 0-10 | Yes |
| Arthralgias | Wake you when are sleeping? |
.46 | .94 | 0-3 | 0-3 | Yes |
| Arthralgias | Impact your emotional wellbeing? | .31 | .67 | 0-3 | 0-3 | Yes |
| Arthralgias | Limit or prevent physical activities? |
.57 | .86 | 0-3 | 0-3 | Yes |
| Arthralgias | Limit or prevent sitting or standing? |
.30 | .59 | 0-2 | 0-3 | Yes |
| Arthralgias | Limit or prevent walking? | .26 | .57 | 0-2 | 0-3 | No* |
| Arthralgias | Limit or prevent work activity? |
.31 | .65 | 0-3 | 0-3 | No |
| Arthralgias | Limit or prevent social activity? |
.16 | .48 | 0-3 | 0-3 | No* |
| Myalgias | How much of the time (daily vs. weekly vs. monthly)? |
2.32 | 2.74 | 0-9 | 0-9 | Yes |
| Myalgias | Severity, usually or most of the time? |
2.81 | 3.41 | 0-10 | 0-9 | Yes |
| Myalgias | Wake you or when you are sleeping? |
.52 | .97 | 0-3 | 0-3 | Yes |
| Myalgias | Impact your emotional well-being? |
.38 | .66 | 0-3 | 0-3 | Yes |
| Myalgias | Limit or prevent physical activities? |
.47 | .74 | 0-3 | 0-3 | Yes |
| Myalgias | Limit or prevent sitting or standing? |
.31 | .60 | 0-3 | 0-2 | Yes |
| Myalgias | Limit or prevent walking? | .28 | .56 | 0-3 | 0-2 | No* |
| Myalgias | Limit or prevent work activity? |
.31 | .66 | 0-3 | 0-3 | No |
| Myalgias | Limit or prevent social activity? |
.18 | .48 | 0-3 | 0-2 | No |
| Cramps | Severity, usually when you have them? |
3.91 | 3.51 | 0-10 | 0-10 | Yes |
| Cramps | Impact your emotional wellbeing? | .37 | .73 | 0-3 | 0-3 | Yes |
| Cramps | When during the day? | 1.91 | 1.70 | 0-4 | 0-4 | Yes |
| Cramps | How much of the time (daily vs. weekly vs. monthly)? |
2.67 | 2.74 | 0-9 | 0-9 | Yes |
| Cramps | Limit or prevent physical activities? |
.38 | .72 | 0-3 | 0-3 | Yes |
| Cramps | Limit or prevent sitting or standing? |
.28 | .60 | 0-3 | 0-3 | Yes |
| Cramps | Limit or prevent walking? | .25 | .53 | 0-3 | 0-2 | No* |
| Cramps | Limit or prevent work activity? |
.24 | .54 | 0-3 | 0-3 | No* |
| Cramps | Limit or prevent social activity? |
.13 | .42 | 0-3 | 0-3 | No* |
| Weakness | How much of the time (daily vs. weekly vs. monthly)? |
2.09 | 3.17 | 0-9 | 0-9 | Yes |
| Weakness | Severity usually or most of the time? |
1.80 | 2.50 | 0-9 | 0-10 | Yes |
| Weakness | Make you need to take naps or sleep longer? |
.28 | .73 | 0-3 | 0-3 | Yes |
| Weakness | Impact your emotional wellbeing? | .35 | .62 | 0-3 | 0-3 | Yes |
| Weakness | Limit or prevent physical activities? |
.55 | .54 | 0-3 | 0-3 | Yes |
| Weakness | Limit or prevent sitting or standing? |
.20 | .49 | 0-3 | 0-3 | Yes |
| Weakness | Limit or prevent walking? | .22 | .50 | 0-3 | 0-3 | No |
| Weakness | Limit or prevent work activity? |
.30 | .65 | 0-3 | 0-3 | No* |
| Weakness | Limit or prevent social activity? |
.18 | .42 | 0-3 | 0-2 | No* |
*
Item loaded strongly on one subscale but was not included in the final measure because it did not increase the explained variance or contribute to improved reliability of the subscale.