Age variation of incidence from childhood to adult age. On this figure, the adult estimates of incidence were taken from the 14 reports of the systematic review using the autoantibodies/C-peptide as diagnostic criteria. Full lines correspond to articles from which both child as well as adult information could be retrieved. The dotted lines are those for which the child information was searched in the same country as in the adult paper, but was from a different paper (see Additional file 3 for details on this literature search). The corresponding countries are shown as: BE1: Belgium (2007) ; BE2: Belgium (2002) ; BE3: Belgium (1997) ; DK: Denmark ; ES1: Spain, Catalonia ; ES2: Spain, Navarra (2014) ; ES3: Spain, Navarra (2013) ; FI: Finland ; IR: Iran (Islamic Republic of) ; IT: Italy [45,46]; SE: Sweden , TW: Taiwan ; US: United States of America .