Urban quarter | No of private households in the quarter (N) | Minimum required returns (n) | No of necessary distributed questionnaires (if 12% response rate) |

Am Ring | 5456 | 359 | 2991 |

Gundeldingen | 10 085 | 370 | 3084 |

Bruderholz | 4038 | 351 | 2924 |

Bachletten | 6710 | 363 | 3028 |

Gotthelf | 3764 | 349 | 2906 |

Iselin | 8860 | 368 | 3069 |

St. Johann | 9180 | 369 | 3073 |

Matthäus | 8012 | 367 | 3055 |

Klybeck | 3506 | 346 | 2886 |

Kleinhüningen* | 1291 | 296 | 2469 |

Total of 10 urban district | 60 902 | 3538 | 29 485 |

*The necessary number of questionnaires was calculated with an expected response rate of 12% and, due to statistical calculations, this means more households should have received a questionnaire than there actually are in Kleinhüningen. Source: Population Statistics 2014, Canton Basel-City.