Numbers of risk factors

Odds ratio

95% CI

1 vs. 0

2 vs. 0

3 vs. 0

4 vs. 0

5 vs. 0

6 vs. 0

7 vs. 0

8≤ vs. 0

1.93

3.23

2.30

1.77

1.84

1.49

1.34

1.19

1.59 - 2.36

2.54 - 4.11

1.99 - 2.66

1.55 - 2.02

1.61 - 2.11

1.30 - 1.71

1.16 - 1.55

1.02 - 1.39