Variable | Group | Mean | Stand. Deviation |

Age (years) | CG-A | 37.5 | 14.7 |

| PI-PI | 41.8 | 15.1 |

Duration of preoperative admission (days) | CG-A | 5.3 | 5.0 |

| PI-PI | 6.2 | 5.1 |

Duration of postoperative admission (days) | CG-A | 8.6 | 3.7 |

| PI-PI | 9.7 | 4.6 |