Table 3.
Model Coefficients for Pain Predicting Insomnia over Two Year Follow-up Period*
| Variable | Unstandardized Beta |
Standardized Beta |
Unstandardized Odds Ratio (95% CI) |
p-value |
|---|---|---|---|---|
| Discharge Insomnia | 0.69 | 0.34 | 1.99 (1.27, 3.16) |
0.003 |
| Discharge SF-36 Bodily Pain IndexΩ | −0.13 | −0.30 | 0.88 (0.80, 0.97) |
0.006 |
| Discharge SF-36 Mental Health IndexΩ | −0.06 | −0.12 | 0.95 (0.84,1.06) |
0.33 |
| Preburn SF-36 Mental Health IndexΩ | −0.21 | −0.42 | 0.81 (0.71, 0.92) |
0.002 |
| Preburn SF-36 General Health IndexΩ | 0.03 | 0.05 | 1.03 (0.90, 1.16) |
0.63 |
| Preburn SF-36 Bodily Pain IndexΩ | 0.04 | 0.09 | 1.04 (0.94, 1.15) |
0.48 |
| Sex | 0.30 | 0.13 | 1.35 (0.87, 2.10) |
0.19 |
| Time Since Discharge | −0.14 | −0.09 | 0.87 (0.63, 1.21) |
0.42 |
| Percent Body Surface Area Burned | 0.01 | 0.10 | 1.01 (0.99, 1.02) |
0.51 |
| Percent Body Surface Area Grafted | −0.00 | −0.09 | 0.99 (0.96, 1.02) |
0.58 |
| Days in I.C.U | 0.01 | 0.23 | 1.02 (0.99,1.04) |
0.16 |
| Age (years) | 0.01 | 0.09 | 1.01 (0.99,1.02) |
0.42 |
| College Educated | −0.34 | −0.15 | 0.72 (0.45, 1.15) |
0.15 |
| White (vs. non-White) | 0.22 | 0.10 | 1.25 (0.79,2.0) | 0.36 |
Note: lower scores on the SF-36 indicate more severe symptoms or decreased function in that domain
*
Brief Symptom Inventory Item# 25 (insomnia = endorsed moderate to extreme distress with trouble falling asleep in the past 7 days)
Null model likelihood ratio test: ChiSq = 8.07, 1 df, p = 0.005
Ω
Values are expressed in units of 10 to facilitate interpretation of odds ratios. Thus, for SF-36 bodily pain, the O.R. = .88, indicates that every 10 point increase in the bodily pain index (increase = less pain) decreased the risk of insomnia by 12%