Table 3.

Univariate models for overall quality of sleep (PSQI total score).

Variable	ß-coefficient	Unadjusted P value	95% confidence interval
BDI (0–63)	0.207	<.001	0.096; 0.317
FIQR (0–90)	0.107	<.001	0.057; 0.158
BPI interference (0–10)	0.773	.002	0.297; 1.249
BPI total (0–10)	0.948	.003	0.338; 1.559
BPI pain (0–10)	0.766	.022	0.112; 1.420
VAS depression (0–10)	0.397	.036	0.026; 0.768
PROMIS pain (0–10)	0.601	.046	0.009; 1.193
Bilateral pain	−2.086	.055	−4.217; 0.045
VAS pain intensity (0–10)	0.525	.100	−0.103; 1.154
Gender (female)	−2.668	.108	−5.941; 0.603
Duration of fibromyalgia (months)	0.103	.124	−0.029; 0.235
PROMIS fatigue (0–10)	0.411	.151	−0.154; 0.977
BMI	0.091	.188	−0.045; 0.227
Race (width, %)	−1.486	.233	−3.955; 0.982
Quality of life (0–112)	−0.043	.247	−0.119; 0.0312
Level of education (Higha, %)	1.684	.289	−1.464; 4.833
Antiepileptics	1.298	.302	−1.195; 3.791
Use of alcohol	1.128	.311	−1.080; 3.337
TSPS	−0.335	.312	−0.993; 0.321
Antidepressants	−1.129	.314	−3.354; 1.09656
VAS anxiety (0–10)	0.199	.327	−0.203; 0.602
VAS stress (0–10)	0.180	.347	−0.200; 0.560
PROMIS anxiety (0–10)	0.273	.463	−0.466; 1.012
Pain-60	−0.084	.814	−0.801; 0.632
CPM response	−0.044	.888	−0.680; 0.591
Age (years)	−0.005	.909	−0.103; 0.092
Baseline Heart Rate	0.004	.920	−0.090; 0.100
HR relative change	0.2727273	.899	−0.276; 5.456

Abbreviations: BDI: Beck depression scale. BMI: body mass index. BPI: brief pain inventory. FIQR: fibromyalgia impact questionnaire. HR baseline: heart rate measure before the patient walked on the treadmill. HR max: 60%–70% of age-predicted maximal heart rate after the patient walked on the treadmill. HR relative change: percentage increase of the HR max compared to the baseline HR (HR max/HR baseline). Number of diseases: number of diseases that the patient has besides Fibromyalgia. PROMIS: patient-reported outcomes measurement information system. PSQI: Pittsburgh sleep quality index. VAS: visual analog scale.

^aHigh education is defined as having a graduate school degree.