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Table 1 Available, invited and participating twins from the Swedish Twin Registry.

From: Genetic and environmental influence on lung function impairment in Swedish twins

Group

1

2

3

4

5

6

Total

Symptoms: twin1, twin2

++

--

--

--

-+

-+

 

Smoking > 10 PY: twin1, twin2

 

--

-+

++

--

++

 

No of available

834

12,008

7,708

4,158

1,050

758

26,516

No of invited

394

128

164

106

86

152

1,030

No of participating

130

56

79

43

42

42

392

Participation in % of available

15.6

0.5

1.0

1.0

4.0

5.5

1.5

  1. Groups: 1) Both have respiratory or minor respiratory symptoms, 2) Both healthy, neither have > 10 pack years, 3) Both healthy, one twin with > 10 pack years, 4) Both healthy, both have > 10 pack years, 5) One twin with respiratory symptoms, one healthy, neither have > 10 pack years, 6) One twin with respiratory symptoms, one healthy, both have > 10 pack years,.