## Table 5 |
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Negative binomial regression model for doctor visits and hospital days (children) |
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Boys (n = 8,260) |
Girls (n = 8,004) |
|||||||

Doctor visits |
Hospital days |
Doctor visits |
Hospital days |
|||||

OR | 95%-CI | OR | 95%-CI | OR | 95%-CI | OR | 95%-CI | |

Age |
||||||||

0-2 | 1.80* | [1.69.1.92] | 2.47* | [1.55.3.94] | 1.77* | [1.66.1.89] | 2.70* | [1.64.4.45] |

3-6 | 1.55* | [1.46.1.65] | 0.90 | [0.59.1.36] | 1.41* | [1.33.1.50] | 1.06 | [0.67.1.66] |

7-10 | 1.08* | [1.02.1.15] | 1.07 | [0.70.1.63] | 1.02 | [0.97.1.09] | 1.28 | [0.82.2.00] |

11-13 | Ref. | Ref. | Ref. | Ref. | ||||

14-17 | 1.10* | [1.04.1.17] | 1.27 | [0.83.1.92] | 1.43* | [1.35.1.51] | 2.94* | [1.90.4.54] |

Income position |
||||||||

< 60% | 1.12* | [1.05.1.21] | 1.85* | [1.12.3.06] | 1.07* | [1.00.1.15] | 2.86* | [1.68.4.88] |

60%- < 150% | 1.05 | [0.99.1.12] | 1.48 | [0.93.2.36] | 1.04 | [0.98.1.11] | 1.18 | [0.72.1.92] |

≥150% | Ref. | Ref. | Ref. | Ref. | ||||

Statistics |
||||||||

chi2 | 566 | 35 | 486 | 66 | ||||

p | 0.000 | 0.000 | 0.000 | 0.000 |

Data: KiGGS 2003-06.

*OR* Odds ratios [95% CI]: 95% confidence interval of the odds ratios based on robust
standard errors. Ref.: reference category of indicator variables. All indicator variables
are coded 0 = no and 1 = yes. Under regression diagnostics, p represents the p value
for the likelihood-ratio test for the respective model. * p< 0.05.

Kroll and Lampert

Kroll and Lampert *BMC Health Services Research* 2013 **13**:271 doi:10.1186/1472-6963-13-271