Normal thyroid gland

Number of cigarettes

0 - 5

5 - 10

10 - 20

more than 20

N

N%

N

N%

n

N%

n

N%

No

0

0.00%

0

0.00%

2

18.2%

2

50.0%

Yes

3

100%

8

100%

9

81.8%

2

50.0%