From: Simple neck pain questions used in surveys, evaluated in relation to health outcomes: a cohort study
 | VARIABLE | QUESTIONS | RESPONSE ALTERNATIVES | NOTES |
---|---|---|---|---|
Aspects of health | Perceived stress | How do you rate your general state of health? | Very good, pretty good, neither good nor poor, pretty poor, poor | Very good health: 1 = Very good health |
 |  |  |  | 0 = Pretty good health or less |
 | Sleep disturbance | During the past 6 months, have you been bothered by: | Never, Once/a few times per year, Once/a few times per month, Several times/week, Every day | Sleep disturbance: Variables based on Keklund and Akerstedt’s work [28] were combined into one variable based on the mean of the four items, rescaled to a 0–10 scale, were 0 is a low level of sleep disturbance and 10 is a high level of sleep disturbance. |
 |  | – difficulties falling asleep? |  |  |
 |  | – repeated awakenings with difficulties going back to sleep? |  |  |
 |  | – not being thoroughly rested at awakening? |  |  |
 |  | – feeling tired/sleepy during studies or leisure time? |  |  |
 | Stress (Mood) | How have you felt during studies/work in the past 7 days? | Not at all, Almost, A bit, Quite, Very, Extremely | Based on the Mood scale [29]. Low stress or energy = 1 and high stress or energy = 6. |
 |  | – rested |  |  |
 |  | – tense |  |  |
 |  | – stressed |  |  |
 |  | – relaxed |  |  |
 |  | – pressured |  |  |
 |  | – calm |  |  |
 | Energy (Mood) | How have you felt during studies/work in the past 7 days? | Not at all, Almost, A bit, Quite, Very, Extremely |  |
 |  | – active |  |  |
 |  | – listless |  |  |
 |  | – energetic |  |  |
 |  | – ineffective |  |  |
 |  | – alert |  |  |
 |  | – passive |  |  |
General performance | Decreased general performance | Have pain/aches in the muscles/joints affected your performance in general during the last month? | Yes, No | 1 = yes |
 |  |  |  | 0 = no |