Associations between different combinations of exposures (income and economic stress) and long duration troublesome neck pain, presented with ORs
| Cohort I, no neck pain at baseline | Cohort II, occasional neck pain at baseline | |
| Combination of exposures | Adjusted OR* (95% CI) | Adjusted OR† (95% CI) |
| Income quartile 2–4, no economic stress (ref) | 1 | 1 |
| Income quartile 2–4, economic stress | 1.2 (0.7 to 2.1) | 1.3 (1.0 to 1.6) |
| Income quartile 1, no economic stress | 1.3 (1.0 to 1.7) | 1.1 (1.0 to 1.3) |
| Income quartile 1, economic stress | 2.0 (1.3 to 3.2) | 1.8 (1.4 to 2.2) |