Discussion

X=# of cigarettes smoked (0=none; light=1-10; heavy=11-20); y= Duration of stress test (min); N=25

0, 34

0, 32

0, 31

5, 27

8, 24

10, 23

15, 20

20, 21

20, 24

0, 25

0, 35

0, 26

4, 22

9, 22

6, 20

17, 15

20, 10

11, 13

0, 21

0, 20

0, 13

10, 17

8, 17

4, 14

10, 16