Model parameter | Mean (95% CI) | p-Value |
---|---|---|

^{a}For countries where BLL and SD data were available, the country’s actual value was used. |
||

BLL | ||

Intercept (β_{0}), BLL (μg/dL)^{a} |
7.33 (6.18, 8.48) | < 0.001 |

Time coefficient (x) |
–0.26 (–0.43, –0.09) | 0.003 |

Quadratic time coefficient (x^{2}) |
0.01 (–0.01, 0.04) | 0.31 |

R^{2} |
0.12 | |

SD | ||

Intercept (β_{0}), SD (μg/dL)^{a} |
0.27 (–0.86, 1.41) | 0.63 |

BLL coefficient (x_{1}) |
0.47 (0.33, 0.60) | < 0.001 |

Time coefficient (x_{2}) |
0.14 (0.05, 0.24) | 0.005 |

Quadratic time coefficient (x_{2}^{2}) |
–0.001 (–0.023, 0.01) | 0.89 |

R^{2} |
0.54 |