Table 1.

Description of measures

Item	N	No. of Items	% of doctors with present symptom/M (SD)	Recoding (if applicable)	Measure	Measure/original scoring
Sleep disturbances
Difficulty falling asleep	390	1	22	0, 1—symptom absent; 2,3,4—symptom present	Insomnia Severity Index (ISI)	0 (scores showing no insomnia) to 4 (showing severe insomnia)
Difficulty staying asleep	390	1	35
Sleep problems interfere with daily functioning	389	1	35
Worried or distressed about a current sleep problem	390	1	20
Dissatisfied with sleep pattern	390	1	44	0, 1, 2—symptom absent (2 is included as it means ‘unsure’); 3, 4—symptom present
Think about work when they go to bed	417	1	61	0, 1—symptom absent; 2, 3—symptom present	Effort-Reward scale	1 (strongly disagree) to 4 (strongly agree)
Trouble sleeping if they postpone tasks	416	1	49
Insomnia	390	7	11	≤14—symptom absent (no, subthreshold insomnia); ≥15—symptom present (moderate, severe insomnia) 31	ISI	7 items; 0 (scores showing no insomnia) to 4 (showing severe insomnia)
Substance use
Substance use in order to feel better	392	1	34	1—symptom absent; 2, 3, 4—symptom present	The Brief COPE	1 (I usually do not do this) to 4 (I usually do this a lot)
Substance use in order to get through something	393	1	22
Frequency of drinking alcohol	386	1	53	1, 2, 3—not drinking or drinking less than two to three times a week; 4, 5—drinking two to three times a week or more often	Alcohol Use Disorder Identification Test	1 (never/1–2) to 5 (daily/>10)
Quantity of drinks on typical day of drinking	362	1	27	1—drinking 1, 2 drinks; 2, 3, 4, 5—drinking three or more drinks
Drink six or more drinks on one occasion	373	1	44	1—never; 2, 3, 4, 5—binge-drinking
Alcohol dependence	377	5	5	Substance abuse was identified if any of the items were answered ‘yes’ 25	The Patient Health Questionnaire	0 (no) and 1 (yes)
Drug use	380	22	44	Drug use was identified if any of the items were answered ‘yes’	Commonly Abused Drugs	22 items; 0 (no) and 1 (yes)
Physical symptoms
Fatigue	390	1	69	1, 2—symptom absent; 3, 4, 5—symptom present	The Physical Symptom Inventory	1 (not at all) to 5 (every day)
Upset stomach or nausea	390	1	19
Backache	390	1	33
Headaches	390	1	27
Acid indigestion or heartburn	390	1	23
Eye strain	390	1	29
Diarrhoea	390	1	12
Ringing in the ears	390	1	13
Stomach cramps	389	1	8
Constipation	390	1	4
Loss of appetite	390	1	7
Dizziness	390	1	8
Eating problems
Eating large amounts of food when not physically hungry	316	1	35	N/A	The Binge Eating Scale	0 (no) and 1 (yes)
Eat until feeling uncomfortably full	316	1	31
Eat alone because they feel embarrassed	315	1	24
Feel disgusted with themselves, depressed or very guilty after overeating	316	1	28
Feel upset about their uncontrollable eating or weight gain	316	1	29
Binge-eating	316	9	8	Please see30 details for coding	The Binge Eating Scale	8 items—0 (no) and 1 (yes); 1 question—0 to 7 days
Predictor variables
Burnout: emotional exhaustion	406	8	55 (M=3.16; SD=1.34)	Recoded for prevalence: <27—symptom absent; ≥27—symptom present35	Maslach Burnout Inventory	9 items; 0 (never) to 6 (every day)
Psychiatric morbidity	393	12	33 (M=2.19; SD=0.55)	Recoded for prevalence: 0, 1 into 0 and 2, 3 into 2; and <4—symptom absent; ≥4—symptom present34	General Health Questionnaire-12	12 items; 0 (better than usual/not at all) to 3 (much less than usual/much less capable)
Effort scale	415	3	M=3.3 (SD=0.6)	N/A	Effort-Reward scale	3 items; 1 (strongly disagree) to 4 (strongly agree)
Work-family Imbalance	416	5	M=5.26 (SD=1.38)	N/A	Work-Family Conflict scale	5 items; 0 (strongly disagree) to 6 (strongly agree)
Coping: substance use	392	2	M=2.33 (SD=0.88)	N/A	The Brief COPE	2 items; 1 (I usually do not do this) to 4 (I usually do this a lot)
Coping: self-blame	393	2	M=1.37 (SD=0.61)	N/A

N/A, not available.