Table 2 Positive responses from questionnaire and analysis of oral fluid

Consumed alcohol within the last 24 h

109

21.0

Consumed 4 or more drinks within 24 h

10

1.9

Absent from work due to drinking alcohol during last 12 months

32

6.2

In-efficiency or hangover at work due to alcohol during last 12 months

126

24.3

Consumed 6 drinks or more in one session at least once a month

105

20.2

Deficient memory after drinking session at least once last 12 months

101

19.5

Deficient memory after drinking session at least once a month

6

1.2

Used medicinal drugs within 48 h

22

4.2

Absent from work because of using medicinal drugs during last 12 months

10

1.9

In-efficiency at work because of using medicinal drugs during last 12 months

17

3.3

Used illegal drugs within 48 h

2

0.4

Absent from work because of using illegal drugs during last 12 months

2

0.4

In-efficiency at work because of using illegal drugs during last 12 months

3

0.6

Analysis of oral fluid (n = 524)

n

%

Alcohol

0

0.0

Ethyl glucuronide

11

2.1

Medicinal drugs

14

2.7

   Zopiclone

7

1.3

   Zolpidem

2

0.4

   Diazepam

4

0.8

   Codeine

1

0.2

Illegal drugs

7

1.3

   THC

5

1.0

   Methamphetamine

2

0.4

Use of alcohol or drugs as revealed by oral fluid analysis and/or self-reporting (n = 526)

n

%

Alcohol within last 24 h¹

114

21.7

Consumed 4 or more drinks during last 24 h¹

18

3.4

Used medicinal drugs within last 48 h²

27

5.1

Used illegal drugs within last 48 h²

9

1.7