## Table 2 |
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Methodological characteristics of included studies |
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Author/Year |
Sampling methods |
Data collection |
Data analysis |

Cranston, 1980 [29] | Non-probability | Questionnaire (24-item Likert scale) | One-way ANOVA, mean, standard deviations and frequency counts |

Dover and Gauge, 1995 [14] | Non-probability | Questionnaire (20-item Likert scale) | ANOVA, frequencies, correlation, chi-square and t-tests |

Birch and Thompson, 1997 [28] | Non-probability | Questionnaire (in-hospital survey) | Frequencies |

Sinclair, 2001 [32] | Non-probability | Questionnaire (postal survey, 25-item Likert scale) | Descriptive, Factor analyses |

Walker et al, 2001 [25] | Non-probability | Questionnaire (18-item Likert scale) | ANOVA, mean, standard deviation |

Munro et al, 2002 [24] | Non-probability | Semi-structured interviews | Framework analysis |

Altaf et al, 2006 [31] | Non-probability | Semi-structured interviews | Constant Comparative Method |

Hindley et al, 2006* [20] | Non-probability | Semi-structured interviews | General thematic analysis |

Blix and Ohlund, 2007 [26] | Non-probability | Interviews | Constant Comparative Method |

McKevitt et al, 2011 [30] | Non-probability | Questionnaire (postal survey, 25-item Likert Scale) and Interviews | Frequencies and thematic analysis |

Hill 2011 [27] | Non-probability | Semi-structured interviews | Colaizziâ€™s Methods with themes formulated |

Smith * et al.*

Smith * et al.* *BMC Pregnancy and Childbirth* 2012 **12**:166 doi:10.1186/1471-2393-12-166