Description Usage Format Details References See Also Examples

A data frame containing the age-dependent distribution of the D-score for children aged 0-5 years. The distribution is modelled after the LMS distribution (Cole & Green, 1992), and is equal for both boys and girls. The LMS values can be used to graph reference charts and to calculate age-conditonal Z-scores, also known as DAZ.

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A `data.frame`

with 265 rows and 17 variables:

Name | Label |

`pop` | Population, either `"dutch"` or `"gcdg"` |

`age` | Decimal age in years |

`mu` | M-curve, median D-score, P50 |

`sigma` | S-curve, spread expressed as coefficient of variation |

`nu` | L-curve, the lambda coefficient of the LMS model for skewness |

`P3` | P3 percentile |

`P10` | P10 percentile |

`P25` | P25 percentile |

`P50` | P50 percentile |

`P75` | P75 percentile |

`P90` | P90 percentile |

`P97` | P97 percentile |

`SDM2` | -2SD centile |

`SDM1` | -1SD centile |

`SD0` | 0SD centile, median |

`SDP1` | +1SD centile |

`SDP2` | +2SD centile |

The `"dutch"`

references were calculated from the SMOCC data, and cover
age range 0-2.5 years (van Buuren, 2014).
The `"gcdg"`

references were calculated from the 15 cohorts of the
GCDG-study, and cover age range 0-5 years (Weber, 2019).

Cole TJ, Green PJ (1992). Smoothing reference centile curves: The LMS method and penalized likelihood. Statistics in Medicine, 11(10), 1305-1319.

Van Buuren S (2014). Growth charts of human development. Stat Methods Med Res, 23(4), 346-368. pdf

Weber AM, Rubio-Codina M, Walker SP, van Buuren S, Eekhout I, Grantham-McGregor S, Caridad Araujo M, Chang SM, Fernald LCH, Hamadani JD, Hanlon A, Karam SM, Lozoff B, Ratsifandrihamanana L, Richter L, Black MM (2019). The D-score: a metric for interpreting the early development of infants and toddlers across global settings. BMJ Global Health, BMJ Global Health 4: e001724. pdf.

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