Risk groups* | Arm | % (n) | RR (95% CI)p value |
---|---|---|---|

Absolute (n) and relative frequencies (%), relative risks (RR), and 95% confidence intervals (95% CI) are given. | |||

*Common relative risk adjusted for risk groups, Breslow-Day test for homogeneity of the odds ratio, χ^{2} = 0.99; df = 2, p = 0.62. | |||

**Cochran-Mantel-Haenszel test statistic. | |||

Overall | WLB+AFB (n = 589) | 5.1% (30) | 1.86* (1.03 to 3.38)p = 0.037** |

WLB (n = 584) | 2.7% (16) | ||

I | WLB+AFB (n = 178) | 6.7% (12) | 1.36 (0.59 to 3.14)p = 0.475 |

WLB (n = 181) | 5.0% (9) | ||

II | WLB+AFB (n = 328) | 4.6% (15) | 2.45 (0.96 to 6.25)p = 0.051 |

WLB (n = 322) | 1.9% (6) | ||

III | WLB+AFB (n = 27) | 11.1% (3) | 2.78 (0.31 to 24.99)p = 0.336 |

WLB (n = 25) | 4.0% (1) | ||

IV | WLB+AFB (n = 56) | 0% (0) | |

WLB (n = 56) | 0% (0) |