Table 2 Summary of the WorkTime Scale survey items and domain classifications by population. Respondents assessed the frequency of each working time exposure over the last year for all jobs held on a Likert Scale: Never (1), Rarely (2), Sometimes (3), Usually (4) and Always (5). Except where noted, higher values indicate more frequent exposure to poor working time characteristics

Q1

I worked more than 12 hours per day

Length

3.0 (0.9)

2.8 (0.9)

1.5 (0.8)

Q2

I worked more than 48 hours per week

Length

3.2 (1.0)

3.3 (1.1)

2.0 (1.2)

Q3

I worked overtime

Length

3.6 (0.9)

3.2 (1.1)

2.8 (1.2)

Q4

I worked some early morning hours between 5 am and 8 am

Time of day

3.2 (1.1)

3.4 (1.2)

2.8 (1.4)

Q5

I worked at least 3 daytime hours between 8 am and 6 pm^a

Time of day

1.8 (1.1)

2.0 (1.2)

1.8 (1.4)

Q6

I worked at least 3 evening hours after 6 pm

Time of day

3.3 (1.1)

3.2 (1.3)

2.0 (1.3)

Q7

I worked at least 3 overnight hours between 11 pm and 5 am

Time of day

3.1 (1.1)

2.6 (1.4)

1.3 (0.6)

Q8

I worked 6 or more days in a row

Intensity

3.3 (1.0)

2.8 (1.2)

2.0 (1.1)

Q9

I had two or more days off in a row^a

Intensity

3.1 (0.8)

2.1 (0.9)

2.7 (1.4)

Q10

I had less than 11 hours between shifts

Intensity

3.1 (0.9)

3.0 (1.1)

1.8 (1.3)

Q11

I was on call (expected to immediately provide work or service if contacted or called)

Control

3.5 (1.1)

2.4 (1.4)

1.7 (1.2)

Q12

I worked mandatory overtime

Control

3.8 (1.0)

2.1 (1.1)

1.7 (1.1)

Q13

I had control over my work schedule^a

Control

3.7 (1.1)

2.6 (1.3)

2.6 (1.4)

Q14

I had to go to work unexpectedly at times when I was not scheduled to work

Predictability

3.3 (1.0)

2.0 (1.0)

1.7 (1.0)

Q15

I unexpectedly had to work more than an hour later than I was scheduled to work

Predictability

3.2 (0.9)

2.5 (0.9)

2.2 (0.9)

Q16

I knew my schedule in advance^a

Predictability

2.8 (1.1)

1.5 (0.7)

1.8 (1.1)

Q17

Last minute adjustments were made to my schedule

Predictability

3.0 (1.0)

2.1 (1.0)

1.9 (0.9)

Q18

I worked on a Sunday

Free time

3.2 (1.1)

3.1 (1.4)

1.8 (1.2)

Q19

I worked on the weekend

Free time

3.4 (1.0)

3.3 (1.2)

2.3 (1.2)

Q20

I worked on a holiday

Free time

3.1 (1.0)

3.1 (1.4)

1.7 (1.1)

Q21

I worked during a special event (e.g., birthday party, wedding, graduation party, etc.)

Free time

2.8 (1.1)

2.9 (1.3)

1.8 (1.1)