STD error | Confidence interval 95% CI for exp (b) | |||||
---|---|---|---|---|---|---|

Variable | Coefficient b | SE (b) | p Value | Odds ratio exp(b) | Lower | Upper |

Final statistical model derived by backwards stepwise logistic regression. | ||||||

Variables entered initially: age, sex, diagnosis, lens status, type of procedure, preoperative visual acuity, astigmatism, rejection, other complications, other pathology, and clinic. | ||||||

Odds ratios >1 (OR>1) indicate increased likelihood that VA≥0.5. | ||||||

OR<1 indicate reduced likelihood that VA≥0.5. | ||||||

For categorical variables, the likelihood associated with each factor is compared with a baseline factor (OR=1.00); for example, the influence of diagnosis is relative to keratoconus. | ||||||

For continuous variables, such as astigmatism, OR>1 indicates increased likelihood that VA≥0.5 with increasing values of the variable. Conversely, OR<1 indicates decreased likelihood that VA≥0.5 with increasing values of the variable. | ||||||

Procedure | ||||||

PKP | 1.00 | |||||

Triple | −1.54 | 0.56 | 0.007 | 0.22 | 0.07 | 0.65 |

Other | −0.60 | 0.77 | 0.43 | 0.55 | 0.12 | 2.46 |

Preoperative visual acuity | 0.99 | 0.36 | 0.006 | 2.67 | 1.33 | 5.44 |

Astigmatism | −1.41 | 0.42 | 0.001 | 0.24 | 0.11 | 0.55 |

Other pathology | ||||||

No | 1.00 | |||||

Yes | −4.63 | 0.65 | <0.001 | 0.01 | 0.003 | 0.04 |

Not known | −2.86 | 0.79 | <0.001 | 0.06 | 0.01 | 0.27 |

Clinic | ||||||

A | 1.00 | |||||

B | 0.66 | 0.80 | 0.41 | 1.94 | 0.41 | 9.24 |

C | −0.44 | 0.97 | 0.65 | 0.65 | 0.10 | 4.32 |

D | 3.04 | 0.72 | <0.001 | 20.80 | 2.08 | 85.16 |

E | 3.39 | 0.75 | <0.001 | 29.52 | 6.83 | 127.61 |

Constant | 4.85 | 1.37 |