Linear mixed-effects model for NPQ scores. The neck support pillow arm did not have a significant effect at 3 or 6 weeks, but did significantly decrease NPQ scores thereafter (12, 24, 52 weeks).
| Variables | Coefficient | Standard Error | p |
|---|---|---|---|
| Exercise | −3.1 | 1.37 | 0.02 |
| Weeks > 3 | −3.6 | 0.83 | < 0.0001 |
| Weeks > 6 | 2.3 | 2.057 | 0.3 |
| NPQ0 (baseline) | 0.6 | 0.061 | < 0.0001 |
| Pillow, weeks ≤ 6 | −0.5 | 1.52 | 0.7 |
| Pillow, weeks > 6 | −3.03 | 1.27 | 0.02 |
NPQ: Northwick Park Neck Pain Questionnaire.