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Table 1 Pearson r (above the diagonal) and nonparametric “rho” (below the diagonal) correlation between all variables

From: Low fertility may be a significant determinant of ovarian cancer worldwide: an ecological analysis of cross- sectional data from 182 countries

  OC56 Ageing Fertility GDP Ibs Obesity Urbanization
OC56 1 0.394*** −0.632*** 0.507*** 0.455*** 0.189* 0.280***
Ageing 0.428*** 1 −0.737*** 0.748*** 0.766*** 0.322*** 0.570***
Fertility −0.655*** − 0.769*** 1 −0.772*** − 0.712*** − 0.338*** − 0.557***
GDP PPP 0.531*** 0.759*** −0.813*** 1 0.742** 0.485*** 0.713***
Ibs 0.602*** 0.849*** −0.883*** 0.858*** 1 0.457*** 0.551***
Obesity 0.169* 0.350*** − 0.377*** 0.453*** 0.409*** 1 0.484***
Urbanization 0.345*** 0.657*** −0.628*** 0.781*** 0.711*** 0.506*** 1
  1. The table shows the bivariate correlation between all the variables. *** p < 0.001; Country number: 167–182
  2. Ovarian cancer (OC56) incidence rate is from the International Agency for Research on Cancer. Birth rate indexing fertility, GDP PPP and urbanization are from the World Bank. Ageing expressed as life expectancy (e65) is from the United Nations. Obesity prevalence is from the World Health Organization
  3. Biological State Index (Ibs) was downloaded from previous publications, which were calculated with the data of the world fertility form the UN Population Council and the WHO life tables