Risk factor

S1

S2

S3

S4

S5

S6

S7

S8

S9

S10

S11

S1

0

0

1

0

1

0

0

0

1

0

0

S2

0

0

1

0

0

0

0

0

0

0

0

S3

0

0

0

1

1

1

0

0

0

0

0

S4

0

0

0

0

0

1

0

0

0

0

0

S5

1

0

0

0

0

0

0

1

0

0

0

S6

1

0

0

1

0

0

0

1

0

0

0

S7

0

0

0

0

0

0

0

1

0

1

0

S8

0

0

0

0

0

0

0

0

0

0

0

S9

0

0

0

0

1

0

0

0

0

0

0

S10

0

0

0

0

0

0

0

0

0

0

0

S11

0

0

1

0

1

0

1

1

0

0

0