Plain language summary
Introduction
Methods
Measures
Statistical analyses
Reliability and internal consistency
Validity
Item response analysis
Results
Age—mean (SDa/min-max) | 52 (13/19–88) | |
n (%) | ||
Women | 310 (76) | |
Living alone | Employed, part or full time | 102 (25) |
Retired | 215 (53) | |
Permanent disability | 57 (14) | |
Sick leave, short or long termb | 79 (19) | |
Otherc | 42 (10) | |
Income level | Low ( < 350 k NOK) | 15 (4) |
Middle (350 k–600k NOK) | 124 (31) | |
High ( > 600 k NOK) | 183 (45) | |
Education | College level or higher | 96 (24) |
Intermediate | 298 (73) | |
Elementary only ( > 10 year) | 89 (22) | |
Health problems, self reported | Physical health problems | 21 (5) |
Mental health problems | 166 (41) | |
Both physical and mental | 18 (4) | |
No health problems | 94 (23) |
Reliability
PROMIS domain | Physical function | Anxiety | Depression | Fatigue | Sleep Dstrb | Social R&A | Pain Intf | Pain intensity NRS |
---|---|---|---|---|---|---|---|---|
Mean T-score (SDa) | 47.6 (10.6) | 50.8 (11.0) | 51.3 (13.0) | 52.3 (11.0) | 52.6 (9.9) | 48.3 (12.2) | 55.0 (11.8) | 3.5b (2.8) |
Ceiling% | 36.4 | .0 | 1.0 | 2.4 | 1.5 | 21.5 | 6.8 | 1.2 |
Floor% | 0.5 | 24.2 | 29.6 | 17.6 | 2.7 | 3.9 | 29.1 | 19.6 |
Cronbach’s alpha | 0.97 | 0.96 | 0.97 | 0.98 | 0.92 | 0.98 | 0.98 | |
McDonalds omega | 0.97 | 0.96 | 0.97 | 0.98 | 0.92 | 0.99 | 0.99 | |
ω_t, (ω_h)c | (0.96) | (0.95) | (0.96) | (0.98) | (0.91) | (0.99) | (0.99) | |
IRT Marginal reliability | 0.87 | 0.91 | 0.89 | 0.94 | 0.92 | 0.93 | 0.90 | |
IRT discrimination meand | 5.9 | 4.7 | 4.8 | 7.4 | 4.0 | 7.5 | 8.5 | |
Eigenvalue ratio per domaind | 12:1 | 10:1 | 16:1 | 33:1 | 5:1 | 54:1 | 26:1 | |
Explained common variance (ECV)e | 0.88 | 0.86 | 0.88 | 0.96 | 0.74 | 0.96 | 0.94 |
Validity
PROMIS | Physical function | Anxiety | Depression | Fatigue | Sleep | Sociala | Painb | PainNRSc |
---|---|---|---|---|---|---|---|---|
Physical function | 1.000 | − 0.409 | − 0.501 | − 0.750 | − 0.541 | 0.822 | − 0.815 | − 0.741 |
Anxiety | − 0.409 | 1.000 | 0.759 | 0.591 | 0.547 | − 0.532 | 0.438 | 0.449 |
Depression | − 0.501 | 0.759 | 1.000 | 0.642 | 0.546 | − 0.585 | 0.509 | 0.462 |
Fatigue | − 0.750 | 0.591 | 0.642 | 1.000 | 0.608 | − 0.857 | 0.728 | 0.688 |
Sleep | − 0.541 | 0.547 | 0.546 | 0.608 | 1.000 | − 0.593 | 0.547 | 0.533 |
Sociala | 0.822 | − 0.532 | − 0.585 | − 0.857 | − 0.593 | 1.000 | − 0.774 | − 0.691 |
Painb | − 0.815 | 0.438 | 0.509 | 0.728 | 0.547 | − 0.774 | 1.000 | 0.918 |
Painc NRS | − 0.741 | 0.449 | 0.462 | 0.688 | 0.533 | − 0.691 | 0.918 | 1.000 |
RAND 36 | ||||||||
RAND36 PF PHYSICAL | 0.880 | − 0.329 | − 0.422 | − 0.675 | − 0.513 | 0.751 | − 0.781 | − 0.731 |
RAND36 RP ROLEPHY | 0.786 | − 0.420 | − 0.479 | − 0.738 | − 0.509 | 0.794 | − 0.737 | − 0.688 |
RAND36 BP BODILYPAIN | 0.793 | − 0.414 | − 0.468 | − 0.713 | − 0.526 | 0.741 | − 0.927 | − 0.918 |
RAND36 GH GENERAL | 0.776 | − 0.524 | − 0.558 | − 0.776 | − 0.620 | 0.785 | − 0.718 | − 0.681 |
RAND36 VT VITALIT | 0.715 | − 0.560 | − 0.632 | − 0.864 | − 0.617 | 0.827 | − 0.670 | − 0.622 |
RAND36 SF SOCIAL | 0.785 | − 0.517 | − 0.587 | − 0.827 | − 0.597 | 0.885 | − 0.743 | − 0.683 |
RAND36 RE ROLEMOT | 0.389 | − 0.545 | − 0.584 | − 0.524 | − 0.441 | 0.488 | − 0.417 | − 0.432 |
RAND36 MH MENTAL | 0.467 | − 0.727 | − 0.806 | − 0.644 | − 0.560 | 0.574 | − 0.480 | − 0.451 |
Unidimensionality (factor validity)
rmsea.scaled | srmr | cfi.scaled | tli.scaled | |
---|---|---|---|---|
Physical function | 0.129 | 0.022 | 0.998 | 0.997 |
Anxiety | 0.080 | 0.019 | 0.998 | 0.998 |
Depression | 0.124 | 0.023 | 0.996 | 0.994 |
Fatigue | 0.115 | 0.010 | 0.999 | 0.999 |
Sleep disturbance | 0.223 | 0.074 | 0.986 | 0.980 |
Social roles and activity | 0.124 | 0.011 | 0.999 | 0.999 |
Pain interference | 0.156 | 0.015 | 0.999 | 0.999 |
Commonly used Cutoffs | < 0.06 | < 0.08 | > 0.95 | > 0.95 |