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Table 5 Synthesis of previously and currently reviewed studies regarding population attributable fraction (PAR) for occupational exposures and asthma.

From: Asthma caused by occupational exposures is common – A systematic analysis of estimates of the population-attributable fraction

Type of study

Studies Included

Ref

Range

Mean

Median

Current review

     

Longitudinal

6

19–24

8.6%–44%

19.3%

16.3%

Case-control

3

26–29

9.5%–21.4%

14.8%

13.5%

Cross-sectional

7

31–37

7.0%–31.3%

16.1%

13.6%

Current and earlier review

     

Longitudinal

6

19–24

8.6%–44.0%

19.3%

16.3%

Case-control

6

26–29, 41–43

9.5%–36.0%

20.7%

12.2%

Cross-sectional

14

31–37, 44–51

7%–51%

21.2%

17.6%

All

26

See above

7%–51%

20.7%

17.6%

All, adult-onset asthma only

17

19–24, 26, 28–31, 34–36, 42, 43, 45

8.6%–44.0%

18.8.5%

16.9%