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Floor and ceiling effects in a two-factor model.
| Effect | Physical interference factor | Affective interference factor | |
|---|---|---|---|
| Back pain (n = 268) | |||
| Floor | 2 (0.7 %) | 4 (1.5 %) | |
| Ceiling | 12 (4.5 %) | 2 (0.8 %) | |
| Neck pain (n = 38) | |||
| Floor | 2 (5.2 %) | 0 (0.0 %) | |
| Ceiling | 1 (2.6 %) | 1 (2.6 %) | |
| Both back and neck pain (n = 29) | |||
| Floor | 0 (0.0 %) | 0 (0.0 %) | |
| Ceiling | 1 (3.4 %) | 0 (0.0 %) | |
| Mixed spinal pain (all participants combined; n = 335) | |||
| Floor | 4 (1.0 %) | 4 (1.0 %) | |
| Ceiling | 14 (4.1 %) | 3 (0.9 %) | |
