Unadjusted and adjusted results of space-time cluster analyses. Analyses were based on the 66% of the study population with data on reproduction and socioeconomic indicators and performed in SpaceStat with 999 permutations, k = 100. 4a shows cluster areas in the Copenhagen areas with each of the two control groups and the combined control group before adjustment. 4b shows cluster areas detected by identical analyses after adjustment for ever/never child birth, age at first birth, number of child births, area-level income and education. The cluster areas presented in the figures illustrate the maximum extent of the cluster areas based on the location of significant cases, and the colours of the areas indicate the control group used. For each cluster area the text box shows how many cases it comprised and its temporal extent. CG: Control Group. The maps contain data from the Danish Geodata Agency and © OpenStreetMap (and) contributors, CC- BY-SA.