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What was learned from following the change in the same worker’s Workability for 8 years?. Masaharu Kumashiro, Manabu Kadoya, Yozo Otsuki, Makoto Kubota, Tsuyoshi Yamashita, and Hiroyuki Izumi. Dept. of Ergonomics, Univ. of Occupational and Environmental Health, Japan.

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What was learned from following

the change in the same worker’s

Workability for 8 years?

Masaharu Kumashiro, Manabu Kadoya,

Yozo Otsuki, Makoto Kubota,

Tsuyoshi Yamashita, and Hiroyuki Izumi

Dept. of Ergonomics, Univ. of Occupational andEnvironmental Health, Japan


Contents of Questionnaire

2002

2003

2004

2005

2006

2007

2000

2001

GHQ

SACL

SDS

GHQ

SDS

Type A

Scale C

score

GHQ

SDS

Type A

Scale C

score

GHQ

Type A

GHQ

Type A

Checklist

for

mental health

Condition

(original)

PSRS-50R

Job

Satisfaction

(original)

MDQ

MDQ

WAI ,

NIOSH job stress Questionnaire


Number

collected

Number

distributed

Response

rate (%)

Average age (MEAN±SD)‏

2000

2001

2002

2003

2004

2005

2006

2007

968

929

906

994

1049

1156

1280

1407

1004

980

980

1076

1067

1251

1350

1447

96.4

94.8

92.4

92.4

98.3

92.4

94.8

97.2

37.8±9.8

38.9±9.6

39.2±9.8

39.7±10.1

40.7±9.9

40.3±10.6

40.0±10.9

40.1±10.9

Number of subjects


The subjectselection

8 years tracked (only WAI)‏

SACL

n=571

SDS

Excellent

GHQ

n= 15

NIOSH

WAI

Good

n=122

WAI

n=221

NIOSH

Moderate

n=76

Poor

n= 968

(in the year2000)‏

n= 8



Trends in WAI categories

Good

Excellent

Poor

Moderate

Years

2000

2001

2002

2003

2004

2005

2006

2007

50%

100%

0%


Trends in NIOSH classifications over eight years

scores

Stressor

Job control

Quantitative workload

Stress response

Depression

0

Years

n=

1004

980

980

1076

1067

1251

1350

1447


Date of the 571 employees

that could be tracked WAI

For 8 years


Trends in WAI categories tracked over 8 years (N=571)

Excellent

Poor

Moderate

Good

Years

2000

2001

2002

2003

2004

2005

2006

2007

0%

50%

100%


Trends in NIOSH classifications for the 571 employees

that could be tracked over eight years

scores

Stressor

Job control

Quantitative workload

Stress response

Depression

n= 571

0

Years


Subject

8 years tracked(WAI)‏

SACL

n=571

SDS

Excellent

GHQ

n= 15

NIOSH

WAI

Good

n=122

n=221

WAI

NIOSH

Moderate

n=76

Poor

n= 968

(in the year2000)‏

n= 8




The correlation between job stressors, NIOSH depression, and changes in WAI< Poor>

Stress response

Stressor

P<0.05

P<0.10


The correlation between job stressors, NIOSH depression, and changes in WAI< Excellent >

Stress response

Stressor

P<0.10

P<0.05


Discussion changes in WAI


< changes in WAIExcellent >

WAI↓

Depression

Stress response

Quantitative

workload

Stressor

WAI↓

Depression

< Poor>


Conclusion changes in WAI

Poor group

There is a tendency for the quantitative workload and other job stressors to

exert an influence on the decline in WAI.

Excellent group

An increase in the symptoms of depression was linked to

   a decline in WAI .

We must consider these characteristics carefully, as it is thought that we might prevent the onset of mental disease by tailoring the management of stress depending on an individual’s WAI category.


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