From: Systematic review of methods for individual patient data meta- analysis with binary outcomes

Analytic approach^{1}
| n/N (%) | |
---|---|---|

One stage approach (n = 19)
| ||

Ignored clustering by study | Logistic regression | 5/19 (26%) |

Fixed effects | Logistic regression | 4/19 (21%) |

Random effects | Logistic regression | 10/19 (52%) |

Fixed study effect with random treatment effect^{2}
| 1/10 (10%) | |

Random study effect with fixed treatment effect^{2}
| 2/10 (20%) | |

Random study effect with random treatment effect^{2}
| 2/10 (20%) | |

Unclear^{1}
| 5/10 (50%) | |

Two stage approach (n = 6)
| ||

Fixed effects | Unspecified | 2/6 (33%) |

Cochrane-Mantel-Haenszel | 1/6 (17%) | |

Random effects | Der Simonian Laird | 2/6 (33%) |

Unspecified | 1/6 (17%) |