Table 1

Domains, constructs and measures in the psychosocial survey

Domain	Construct	Measure	Description
Health behaviours
	Physical activity	Global Physical Activity Questionnaire71	Assesses physical activity at work, during transportation and during leisure; used to calculate metabolic equivalents
	Smoking	Tobacco use*	Assesses current and past smoking and nicotine use behaviour
	Alcohol use	Alcohol Use Questionnaire*	Assesses current and past alcohol use, including frequency and amount
	Sleep	Insomnia Severity Index72	Assesses the perceived severity of DSM-V chronic insomnia symptoms
		Snoring, Tired, Observed, Blood Pressure73	Assesses self-reported symptoms of sleep apnoea; score ≥2 indicative of apnoea risk
		Self-Assessment of Sleep*	Assesses sleep quantity and quality during the week and weekends, number of hours needed to feel rested, overall sleep quality and duration of current sleep pattern
Psychosocial stress
	Social vigilance	Social Vigilance Questionnaire (SVQ)*	Assesses frequency of vigilant behaviours in social contexts; subscales include: social threats, others’ reactions to self, self
	Perceived stress	Perceived Stress Scale74	Assesses perceptions of the frequency of stressful events
	Job strain	Job Content Questionnaire75	Assesses psychological dimensions of job environments; subscales include: job demand, job control, job strain
Individual differences
	Trait negative affect	Eysenck Personality Questionnaire – Neuroticism76	Assesses trait negative affectivity
	Trait anger/hostility	Aggression Questionnaire77	Assesses trait anger and hostility (subscales only)
	Trait optimism	Life Orientation Test-Revised78	Assesses dispositional optimism/positivity and dispositional pessimism
	Trait anxiety	State Trait Anxiety Inventory79	Assesses individual differences in dispositional anxiety
	Depressive symptoms	Center for Epidemiological Studies- Depression Scale80	Assesses depressive symptoms and levels of depression
	Cognitive rumination	White Bears Suppression Inventory81	Assesses tendency to suppress thoughts
Social functioning
	Perceived social support	Interpersonal Support Evaluation List 82	Assesses perceived social support; subscales include: appraisal, belonging, tangible
	Perceived discrimination	The Everyday Discrimination Scale (EF)83	Assesses frequency of perceived unfairness and attributions for such treatment (eg, race/ethnicity, age, gender and so on)
	Relationship distress	Marital Satisfaction Inventory84 85	Assesses degree of marital distress; subscales include: disaffection, disharmony
	Relationship ambivalence	Social Relationships Index86	Assesses positive and negative dimensions of interpersonal relationships

DSM-V, Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition
* measure developed for this study